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Why did my donor test negative during a saliva test for medical marijuana (THC)?

The test results could be negative if the donor:

  • Had any items in his/her mouth, (i.e. tobacco products) within 15 minutes prior to the test.
  • Has dentures or denture paste in his/her mouth.

The window for detection of medical marijuana (THC) in saliva is typically 14 hours or less.

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