Pre-employment Drug Testing - cover
  • Pre-employment drug testing involves testing job candidates for certain drugs before they can start working for the employer.
  • Employers can refuse to hire job applicants who test positive on a drug test. 
  • Federal law doesn’t require or prohibit employers from conducting drug tests, except for certain job applications.
  • Many states have enacted their own drug testing laws.
  • The most common type of pre-employment drug test is the urine drug test.
  • Depending on the drug screening, traces of certain drugs can be found for up to 90 days after the last consumption.

What are pre-employment drug testing laws?

  • Urine drug test,
  • Saliva drug test,
  • Hair drug test, and
  • Blood drug test.

What are federal drug testing laws?

  • Ensure and maintain a drug-free workplace, and
  • Allow employers to enact a policy reflecting a drug-free workplace and include it as a factor in the hiring process. 
  • Safety-sensitive employees (e.g., bus drivers, truck drivers, pilots, and other workers employed under the Department of Transportation), and
  • Federal contractors who work in positions of national security (employed under the Department of Defense).

Pre-employment drug testing laws by state

StatePre-employment drug testing law?Covered employersApplicant testing regulationsRefusal grounds for a positive testMarijuana legalization status
AlabamaYesAll employers.Testing is allowed after the applicant receives a conditional job offer and a drug testing notice from the employer.A positive test or refusal of drug testing can be grounds for not hiring.Medical use is legal.
AlaskaYesAll employers, including school districts and any educational attendance areas. Allowed when the job applicant receives a written notice for the drug testing at least 30 days in advance.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
ArizonaYesAll employers.Allowed when the job applicant receives a written notice for the drug testing. A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
ArkansasYesAll employers.Testing is allowed after the applicant receives a conditional job offer and a drug testing notice from the employer.A positive test or refusal of drug testing can be grounds for not hiring.Medical use is legal.
CaliforniaYesAll employers. However, it’s prohibited to discriminate against employees for off-site or off-job cannabis use.Testing is allowed as a condition for employment. However, employers must test all job applicants.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
ColoradoNoNo state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.Medical and recreational use is legal.
ConnecticutYesApplies to private employers. All state employees except drivers are exempt from drug testing laws.Allowed when the job applicant receives a written notice for the drug testing. Applicants who fail the test must be given a copy of the test results.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
DelawareNoNo general rules for public agencies. However, employees working in security-sensitive positions under the Department of Correction must be drug tested.Before conducting a drug test, employers should inform the employees about the drug test.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
District of ColumbiaYesAll employers.Employers can only test job applicants for marijuana use after they’ve given them a job offer. However, other types of drug tests can also be carried out during the interview stage.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
FloridaYesAll employers.Testing is allowed after the applicant receives a conditional job offer and a drug testing notice from the employer.The drug testing notice must also be included in the job advertisement.A positive test or refusal of drug testing can be grounds for not hiring.Medical use is legal.
GeorgiaYesAll employers.Testing is required after the applicant receives a conditional job offer. Employers are allowed to test only applicants who are applying for higher-risk positions. A drug testing notice must also be included in the job advertisement.A positive test or refusal of drug testing can be grounds for not hiring. Applicants who use drugs for medicinal reasons cannot be discriminated against.Medical and recreational use is illegal. Only low-THC products (e.g., CBD oil) are allowed.
HawaiiYesAll employers.Testing is allowed after the applicant receives a conditional job offer and a drug testing notice from the employer.A positive test or refusal of drug testing can be grounds for not hiring.Medical use is legal.
IdahoYesApplies to private and public sector employers.There are no strict rules at which stage of the hiring process employers can conduct drug tests. However, employers must clearly outline the procedure in their drug testing policyA positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is illegal.
IllinoisYesAll employers.Employers can conduct drug testing at any time during the hiring process.A positive test or refusal of drug testing can be grounds for not hiring. However, employers cannot take adverse action against job applicants based only on a positive test for cannabis.Medical and recreational use is legal.
IndianaNoNo state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is illegal. Only low-THC products (e.g., CBD oil) are allowed.
IowaYesPublic and private employers.Employers can conduct drug testing, but they must make the drug testing policy available for review by the job applicant. A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is illegal.
KansasYesPrivate employers and certain public sector employers (e.g., security-sensitive positions).Testing is allowed after the applicant receives a conditional job offer.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is illegal. Only zero-THC products (e.g., CBD oil) are allowed.
KentuckyYesPrivate and public employers.Testing is allowed after the applicant receives a conditional job offer.A positive test or refusal of drug testing can be grounds for not hiring.Medical use is legal.
LouisianaYesAll employers.Employers who perform drug screenings must use specialized laboratories and procedures if they want to base their hiring decisions on those tests.A positive test or refusal of drug testing can be grounds for not hiring.Medical use is legal.
MaineYesAll employers.Employers can conduct drug tests during the hiring process, but they must inform all applicants of the test requirements.Also, employers must get signed consent from the employee before testing.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
MarylandYesAll employers.Employers can perform drug tests at any stage of the hiring process. However, employers must be registered under the Maryland Office of Health Care Quality to perform any testing on job applicants.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
MassachusettsNoNo state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.Medical and recreational use is legal.
MichiganNoNo state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.Medical and recreational use is legal.
MinnesotaYesPublic and private employers.Testing is allowed after the applicant receives a conditional job offer and a drug testing notice from the employer.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
MississippiYesPublic and private employers.Allowed when the job applicant receives a written notice for the drug testing. A positive test or refusal of drug testing can be grounds for not hiring.Medical use is legal.
MissouriNoNo state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.Medical and recreational use is legal.
MontanaYesPublic and private employers.Applicants can be tested during the hiring process before getting a job offer.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
NebraskaNoNo state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.Medical and recreational use is illegal.
NevadaYesState agencies.Employers must outline the drug testing procedure in their drug testing policy. Employers cannot refuse to hire a potential employee due to a failed drug test for marijuana.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
New HampshireNoNo state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.Medical use is legal.
New JerseyYesAll employers.Employers who conduct drug tests must notify job applicants in advance and give them room for explanation if the test returns positive.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
New MexicoNoNo state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.Employers are free to drug test employees during the hiring process. If the company policy requires drug tests for applicants, they must submit the results before the final round of interviews.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
New YorkNoNo state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.Certain groups of employees (e.g., safety-sensitive positions and drivers) must be tested before employment.As for marijuana testing, the state of New York banned this type of pre-employment screening.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
North CarolinaYesPublic and private employers.Employers can conduct pre-employment drug screenings at any time during the hiring process.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is illegal.
North DakotaNoNo state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.Medical use is legal.
OhioYesAll employers.Testing is allowed after the applicant receives a conditional job offer.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
OklahomaYesPublic and private employersTesting is allowed after the applicant receives a conditional job offer and a written drug testing notice from the employer.A positive test or refusal of drug testing can be grounds for not hiring.Medical use is legal.
OregonYesAll employers.There are no specific rules, but tests are required for applicants in safety-sensitive industries or businesses (e.g., school bus drivers). A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
PennsylvaniaNoNo state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.Employers can drug test employees during the hiring process.A positive test or refusal of drug testing can be grounds for not hiring.Medical use is legal.
Rhode IslandYesPublic and private employersTesting is allowed in private, without the presence of any other person, once the applicant receives a conditional job offer. Testing is allowed in the public sector for safety-sensitive jobs and when it’s required by federal law.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
South CarolinaYesPublic and private employers.Employers can conduct drug testing during the hiring process, but they must provide guidelines to applicants. The guidelines must outline drug testing procedures and consequences for failing the test.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is illegal.
South DakotaYesState government employers.Allowed for applicants to safety-sensitive positions upon the conditional job offer. All job advertisements must include notice of drug testing requirements.A positive test or refusal of drug testing can be grounds for not hiring.Medical use is legal.
TennesseeYesState government employers.Covered employers must test job applicants in safety-sensitive positions (e.g., school bus drivers) after extending a conditional job offer. Also, employers must include a drug testing notice in their job advertisements.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is illegal.
TexasNoNo state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.Medical and recreational use is illegal.
UtahYesLocal government entities, private employers, and state institutions of higher education.Employers are allowed to drug test job applicants as long as managers and employers also submit to periodical drug testing.A positive test or refusal of drug testing can be grounds for not hiring.Medical use is legal.
VermontYesPublic and private employers.Employers are allowed to conduct pre-employment drug testing only if they give a conditional job offer to the applicant. Also, they must notify the applicant of the testing procedure in written form. A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is legal.
VirginiaNoNo state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.A positive test or refusal of drug testing can be grounds for not hiring. However, employers cannot discriminate against job applicants for the use of cannabis oil if they have a valid written certification issued by the health practitioner. Medical and recreational use is legal.
WashingtonYesPrivate employers who want to qualify for a 5% workers’ compensation and premium discount if approved by state authorities.Employers can conduct drug testing when an applicant receives an advance notice and a conditional job offer.A positive test or refusal of drug testing can be grounds for not hiring. However, according to ESSB 5123, employers cannot discriminate against job applicants for the use of cannabis oil if they have a valid written certification issued by the health practitioner.Medical and recreational use is legal.
West VirginiaYesAll employers.Employers can conduct drug tests as long as they have the procedures outlined in their drug testing policies and don’t violate state law. Applicants must also be notified that a drug test is required as a condition of employment.A positive test or refusal of drug testing can be grounds for not hiring.Medical use is legal.
WisconsinNoNo state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is illegal.
WyomingNoNo state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.No state laws; federal rules apply. Employers are not required or prohibited to conduct pre-employment drug tests.A positive test or refusal of drug testing can be grounds for not hiring.Medical and recreational use is illegal.

Frequently asked questions about pre-employment drug testing laws

Can you be drug tested at an interview?

How long does pre-employment drug screening take?

  1. Urine drug test — This is one of the most common types of drug tests for pre-employment screening. Providing a urine sample takes a few minutes, but the overall time for the drug screening can vary depending on the lab’s workload and the number of samples it needs to process. Employers can expect to receive the results within a few days, usually up to 2 business days.
  2. Saliva drug test — Although saliva drug tests are less common for pre-employment screening, they are faster to administer than urine tests. The results are also usually available within a few days.
  3. Hair drug test — This type of test is less common for pre-employment screening due to its higher cost and longer detection window. Collecting the hair sample is quick, but the analysis can take longer. Hair tests can detect drug use from several months ago, and the results may take a week or more to come back.
  4. Blood drug test — Blood tests are relatively rare for pre-employment screening due to their invasiveness and high cost. They provide real-time information, but processing the results may take a few days.
  • Sample travel time to the lab (if applicable),
  • Anything related to the necessary paperwork, and
  • The testing facility’s capacity and workload at the moment.

What is the pre-employment drug testing time frame?

What is the most common drug test for employment?

How do you fight a failed DOT drug test?

  • Request a re-test — Some employers and testing programs allow you to request a re-test if you believe there was an error in the initial test. That procedure may involve analyzing the already provided sample for the second time or conducting a new drug test with a new sample.
  • Review the chain of custody — Any discrepancies in maintaining and documenting your samples can be grounds for challenging the test results. You’ll need to file an official complaint with your employer, and the employer must do the same with the testing facility. The rest of the process is done internally by the facility’s officials in charge.
  • Confirm prescription medication — If you’re taking prescription medications, gather evidence to prove your valid prescription. Also, make sure to inform the Medical Review Officer (MRO) of any prescription drugs you are taking at that moment.
  • Speak with the Medical Review Officer (MRO) — If you believe there might be an error, you can discuss the situation with the MRO to present any evidence or information that may clarify the results.
  • Challenge the testing methodology — The testing methodology or equipment used may have flaws or limitations, so you can inquire whether it could have led to a false positive result.
  • Seek legal advice — If you believe the failed drug test could unfairly jeopardize your career, you may want to seek legal advice from an employment attorney.

What is reasonable suspicion drug testing?

What is post-accident drug testing?

What is random drug testing in the workplace?

What jobs have federal drug testing regulations?

  • Department of Transportation (DOT) jobs — Employees in safety-sensitive positions within the transportation industry (e.g., truck or bus drivers, pilots, railroad workers) are subject to drug and alcohol testing regulations enforced by the DOT,
  • Federal Aviation Administration (FAA) jobs — Employees in safety-sensitive roles within the aviation industry (e.g., pilots, air traffic controllers, aircraft maintenance personnel) are subject to drug and alcohol testing under FAA regulations,
  • Federal Railroad Administration (FRA) jobs — Workers in safety-sensitive positions in the railroad industry, including train crews, engineers, and signallers, are subject to drug and alcohol testing according to FRA regulations,
  • Pipeline and Hazardous Materials Safety Administration (PHMSA) jobs — Employees involved in the transportation of hazardous materials via pipelines or other means may be subject to drug and alcohol testing under PHMSA regulations.
  • Federal Transit Administration (FTA) jobs — Safety-sensitive employees in the public transportation industry (e.g., bus drivers and other transit workers) are subject to drug and alcohol testing according to FTA regulations,
  • Nuclear Regulatory Commission (NRC) jobs — Employees in safety-sensitive positions at nuclear power plants and related facilities are subject to drug and alcohol testing under NRC regulations, and
  • Department of Defense (DoD) jobs — Military personnel and civilian employees in safety-sensitive roles within the Department of Defense may be subject to drug testing.

What is a 12-panel pre-employment drug test?

  • Cocaine,
  • Marijuana,
  • PCP, 
  • Amphetamines, 
  • Opiates, 
  • Benzodiazepines, 
  • Barbiturates, 
  • Methadone, 
  • Propoxyphene, 
  • Ecstasy/MDA, and 
  • Oxycodone/Percocet.

How long does it take for a drug to be cleared from the body?

Drug typeUrine testBlood testHair test
MarijuanaUsually 3 to 7 days, but it can stay up to 30 days for heavy users.Up to 12 hours.Up to 90 days.
CocaineUp to 3 days, but it can stay longer for users who use it constantly.Up to 48 hours.Up to 90 days.
HeroinUsually 1 to 4 days, but it can stay longer for users who use it constantly.Up to a few hours after the last consumption.Up to 90 days.
MethadoneUp to 7 days.2 to 3 days.Up to 90 days.
Amphetamines1 to 3 days.Around 12 hours.90 to 180 days.
Percocet3 to 4 days.Up to 24 hours.Up to 90 days.

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Conclusão/Aviso legal

  • Provided as sources and linked in the article, or
  • Used as sources in the State Labor Laws guides linked earlier in this guide.
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