Indiana Drug Testing Laws: At-Will Rules and ADA Limits

Indiana’s drug testing laws give private employers wide latitude and give employees comparatively few statutory protections. The key state statute, Indiana Code 22-9-5-24, expressly says nothing in Indiana’s disability rights chapter encourages, prohibits, or authorizes drug testing of job applicants or employees.¹ That neutrality pushes most workplace disputes about testing into federal law, employer policy documents, and common-law claims like invasion of privacy or discrimination.

What the State Statute Actually Says

Indiana Code 22-9-5-24 sits inside the state’s civil rights chapter on disabilities and does three things. It declares that a drug test for illegal substances is not a medical examination under Indiana law. It states that nothing in the chapter encourages, prohibits, or authorizes employers to test or to make hiring and firing decisions based on results. And it preserves the authority of employers regulated by the U.S. Department of Transportation, the Department of Defense, and the Nuclear Regulatory Commission to test employees in safety-sensitive roles and remove anyone who tests positive.¹

What the statute leaves out matters just as much. There is no mandatory advance notice, no required confirmation testing, no split-specimen right, and no obligation to use a certified lab for private-sector tests. Indiana is not among the states with detailed statutes spelling out when and how employers may test. That silence lets private employers write their own rules, which is why the quality of an employer’s written policy carries so much weight when a dispute lands in court.

At-Will Employment and What Employers Can Do

Indiana is an at-will employment state. An employer can fire a worker for any reason that does not violate public policy, and Indiana courts read that principle broadly. No state statute requires a private employer to have a written drug testing policy, and none dictates how an employer must respond to a positive result. An employer with a clearly communicated drug-free workplace policy can generally terminate an employee who tests positive, refuse to hire an applicant who tests positive, or discipline a worker who refuses a test.

The trade-off is that a sloppy or inconsistently applied policy creates real litigation exposure. Employers who test one group of workers but not another invite discrimination claims. Employers who spring a test with no prior written notice may face arguments that the test was retaliatory or arbitrary. And employers who publicly disclose a positive result open themselves to defamation or invasion-of-privacy suits. In Indiana’s permissive framework, a well-drafted and evenly enforced policy is the single best legal shield an employer has.

When Federal Rules Take Over

Federal law fills much of the space Indiana leaves empty. The Omnibus Transportation Employee Testing Act of 1991 requires drug and alcohol testing for employees performing safety-sensitive functions under Department of Transportation oversight, including commercial truck drivers, airline crew, pipeline workers, and transit operators.² The implementing regulation, 49 CFR Part 40, sets uniform testing procedures every DOT-regulated employer must follow.

Part 40 requires six categories of testing: pre-employment, random, reasonable suspicion, post-accident, return-to-duty, and follow-up. The test panel covers five drug classes: marijuana metabolites, cocaine metabolites, amphetamines, opioids, and phencyclidine. Only urine and oral fluid specimens processed at HHS-certified laboratories qualify; point-of-collection instant tests and hair tests do not.³ An employee who tests positive must be removed from safety-sensitive duties immediately and cannot return until a substance abuse professional has evaluated them and they pass a return-to-duty test.

Because Indiana Code 22-9-5-24 explicitly preserves DOT jurisdiction, Indiana employers in these industries cannot argue that state silence overrides the federal mandate.¹ Violations of DOT rules can bring federal civil penalties and loss of operating authority.

State Employees and Public Works Contractors

Indiana does regulate testing in two specific pockets. The State Personnel Department maintains a detailed program for state employees covering pre-employment, random, reasonable-suspicion, post-accident, return-to-duty, and follow-up testing. Any state employee may be subject to reasonable-suspicion testing after supervisors follow documented observation protocols.⁴ A state employee who tests positive can request a split-specimen retest at a different SAMHSA-certified lab within 72 hours of notification, though the employee pays for the second test.⁵

Private contractors bidding on state public works projects work under Indiana Code 4-13-18. A contractor’s testing program must test every employee at least once a year, randomly select at least two percent of its workforce for testing each month, and use a minimum five-drug panel covering amphetamines, cocaine, and opiates.⁶ Contractors with collective bargaining agreements can satisfy these requirements through the CBA if it includes random testing, the five-drug panel, and specified discipline such as suspension or termination for a failed test, with reinstatement conditioned on a negative retest and at least one year of follow-up testing.⁷ A contractor without a qualifying program is effectively shut out of state work because the testing plan is part of the bid itself.

Employee Protections That Do Apply

With state statutes silent for the private sector, most employee protections come from federal law and common-law tort claims.

Disability Discrimination Under the ADA

The Americans with Disabilities Act prohibits employers from asking all employees what prescription medications they take unless the inquiry is job-related and consistent with business necessity.⁸ An employee who tests positive because of a legally prescribed medication for a covered disability cannot be penalized automatically. The employer must engage in an interactive process to see whether a reasonable accommodation exists that does not compromise workplace safety. Employers in public-safety roles can require reporting of medications that could affect essential job functions, but only when they can show that impaired performance would create a direct threat.

An employer refusing to accommodate can invoke the undue-hardship defense, but courts scrutinize the evidence. Calling the accommodation expensive or inconvenient is not enough; the employer must show genuine difficulty or significant cost relative to the size and resources of the business.⁸

Privacy and Defamation

Indiana employees may have invasion-of-privacy claims if the testing process itself is unreasonably intrusive, such as direct-observation urine collection without adequate justification. Employers who disclose a positive result to people who have no legitimate business reason to know it risk privacy and defamation claims, especially if the employer had reason to doubt the accuracy of the result. Mishandling confidential results is one of the fastest ways to end up in court.

Selective or Discriminatory Testing

An employer that singles out employees of a particular race, age, or gender for testing while exempting others faces discrimination claims under both federal and state civil rights laws. The safer approach is a written policy that defines objective, neutral triggers, such as involvement in a workplace accident or observable signs of impairment, and applies them uniformly.

Marijuana and CBD Are Not Protected

Indiana remains one of roughly ten states without a medical or recreational marijuana program. Marijuana is illegal for all purposes under Indiana law, and recent legislative sessions have focused on tightening restrictions on delta-8 THC products rather than loosening the law. There are no state-level employment protections for marijuana users in Indiana.

Indiana does allow low-THC cannabis oil containing no more than 0.3% THC and at least 5% CBD, but that provision is a defense to criminal prosecution, not immunity from employer discipline. An employee using a legal CBD product could still trigger a positive test depending on the sensitivity of the screen and the THC content of the product, and Indiana law does not require employers to accommodate CBD or hemp use. Even if federal rescheduling moves marijuana from Schedule I to Schedule III, recreational possession would remain illegal without a valid prescription, and DOT-regulated employers would still test for marijuana metabolites under 49 CFR Part 40.³

What a Positive Test Costs in Unemployment Benefits

A positive drug test or a refusal to test can reach beyond the job itself. Under Indiana Code 22-4-15-6.1, an employee fired for “gross misconduct” loses eligibility for current unemployment benefits and all previously accumulated wage credits. Working while intoxicated from alcohol or a controlled substance, reporting to work intoxicated, or using a controlled substance on the employer’s premises without permission all qualify as gross misconduct.⁹

Job seekers face a separate rule. If you test positive on a drug test given as a condition of a job offer, or if you refuse one, you are disqualified from unemployment benefits until you submit a negative test to the Indiana Department of Workforce Development. Missing a scheduled test is not automatically a refusal; you have a 72-hour window to reschedule and complete it. A test is not treated as positive unless a second confirmation test using gas chromatography-mass spectrometry comes back positive and a licensed physician reviews the result, or you have no valid medical reason for the substance found.

There is an important exception: conduct is not gross misconduct if the employer’s own actions or requirements contributed to the behavior that led to the firing, and lawful conduct the employer has not otherwise prohibited also falls outside the definition.⁹

Building a Testing Program That Holds Up

Indiana does not mandate specific testing procedures for private employers, but employers who cut corners on methodology pay for it in litigation. SAMHSA publishes federal workplace drug testing guidelines covering laboratory certification, specimen handling, and cutoff levels. Those guidelines technically apply only to federal agencies, but many private employers follow them because using a SAMHSA-certified lab makes results far more defensible in court.

For state employees, Indiana’s State Personnel Department requires that split specimens be collected so the employee can request an independent retest. Private employers are not required to do this, but offering split-specimen testing strengthens the credibility of any adverse action based on a positive result. An employee who knows a second sample exists is less likely to prevail on a claim that the test was unreliable.⁵

Because Indiana imposes so few affirmative testing requirements on private employers, non-compliance in this state usually means violating the employer’s own policy, federal law, or employees’ common-law rights rather than breaking a state drug-testing statute. The consequences remain real. Inconsistent testing invites ADA and Title VII claims. Careless disclosure invites privacy and defamation claims. And DOT-regulated employers who ignore 49 CFR Part 40 risk federal civil penalties and the loss of their operating authority.

1
Indiana General Assembly. Indiana Code 22-9-5-24 – Alcohol and Illegal Use of Drugs; Prohibitions; Requisites; Testing
2
U.S. Department of Transportation. Omnibus Transportation Employee Testing Act of 1991
3
eCFR. 49 CFR Part 40 – Procedures for Transportation Workplace Drug and Alcohol Testing Programs
4
Indiana State Personnel Department. Drug and Alcohol Testing
5
Indiana State Personnel Department. Drug and Alcohol Testing Policy for TDPs and Other Employees
6
Indiana General Assembly. Indiana Code 4-13-18-6 – Employee Drug Testing Program
7
Indiana General Assembly. Indiana Code 4-13-18-5 – Employee Drug Testing Plan Required in Bid; Collective Bargaining Agreements
8
U.S. Equal Employment Opportunity Commission. Enforcement Guidance on Disability-Related Inquiries and Medical Examinations of Employees Under the ADA
9
Indiana General Assembly. Indiana Code 22-4-15-6.1 – Gross Misconduct