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The Global Insight

Can an employer keep you if you fail a drug test?

Author

Christopher Davis

Updated on April 06, 2026

Generally speaking, if you fail a pre-employment drug test, the company may legally refuse to hire you. And, if you fail a drug test while employed, your employer may legally terminate your employment or prevent you from being promoted.

Do failed drug tests show up on background checks?

Prior criminal convictions, including drug charges, are visible on a background check, but what is not visible is any prior failed drug test. This information is kept strictly confidential between the employer who required the test and the individual whom took the test, regardless of the testing results.

What is the best excuse for failing a drug test?

Here are a few creative excuses relayed to us:

  1. “I was at a party over the weekend – can I retest later?”
  2. “I didn’t know the brownies I ate were laced with pot!”
  3. “I took some elephant tranquilizers.
  4. “It must have been the tea that my wife gave me last night.”
  5. “My dentist gave me cocaine for my sore tooth.”

What if I fail my DOT drug test?

If you fail your DOT regulated drug test, DOT regulations require your employer to immediately remove you from performing any DOT safety-sensitive job. There may be other consequences, too, like losing your certification or license. This depends on your company’s policy or employment agreement.

What happens if a trucker fails a drug test?

FMCSA told Overdrive in a statement that any driver who fails a drug test and has not completed the required return-to-duty procedures is disqualified from driving. But, says Close, “it’s up to the employer to learn of it,” if a driver doesn’t notify their fleet they’ve failed a drug test elsewhere.

What happens if you fail a drug test at work?

The good news for you though is that, even if you fail a drugs test at work, this may not result in you being sacked on the spot. Your Rights As An Employee The law says that employers can make it mandatory for staff to undergo drugs testing at work if they suspect they are taking illegal substances.

Can a employer dismiss an employee for a positive drug test?

It can also be lawful for an employer to dismiss an employee in the event of a positive result. However, the overriding requirement is for the employer to act reasonably in all the circumstances, when considering dismissal is and a positive test result could have a plausible explanation, or be unreliable.

Do you have to pass a drug test to get a job?

Employers today commonly require new employees to submit to and pass a drug test before starting work. However, certain medications such as those used to treat chronic pain, can result in a failed drug test because they are opiates or narcotics.

Why do employers need to know about drug testing?

“This is likely because drug tests for marijuana are still imperfect and detect use from days and weeks prior,” Welch noted. Under federal law, employers may need to follow Fair Credit Reporting Act notice requirements if they use a background-check company to obtain the results from a drug testing lab.