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Post-Accident Drug & Alcohol Testing: When It's Required

Not every crash triggers a test — but when the criteria are met, the clock starts immediately. Knowing the rules protects you both ways.

5 min read · Updated 2026-08-05

When post-accident testing is required

Testing is required after a crash when specific conditions are met. In general terms, a test is required if the accident involved:

  • A fatality — testing is required regardless of citation
  • A bodily injury treated away from the scene, when the driver receives a citation
  • Disabling vehicle damage requiring a tow, when the driver receives a citation

The time limits

  • Alcohol — test as soon as possible; if not done within 8 hours, stop attempts and document why
  • Drugs — test as soon as possible; if not done within 32 hours, stop attempts and document why

Document either way

If a qualifying accident occurs and a test cannot be completed in time, keep a record explaining why. That documentation is part of a compliant program — see the full drug & alcohol testing guide.

Prepare in advance: drivers should carry clear post-accident instructions so testing is not missed in the chaos after a crash.

Frequently asked questions

Does every accident require a drug test?

No. Post-accident testing is required only when specific criteria are met — such as a fatality, or an injury or disabling tow-away combined with a citation to the driver.

How fast must a post-accident test happen?

Alcohol testing should be done as soon as possible and generally within 8 hours; drug testing as soon as possible and generally within 32 hours. If missed, document the reason.

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