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What are the possible ways to test for tobacco, alcohol and mariujana In a person? Though he has quit on all of these a month ago.

1 doctor weighed in
Dr. Cynthia Rector
Psychiatry

In brief: Blood, urine, Saliva

There are tests using any of the above body fluids.
If tobacco and alcohol were last used a month ago they will not show in a body fluid test. If you were a heavy marijuana user, it is possible that it could still show positive in body fluid test. There are also drug tests that use hair. On that test, any substance use in the past 90 days will show up.

In brief: Blood, urine, Saliva

There are tests using any of the above body fluids.
If tobacco and alcohol were last used a month ago they will not show in a body fluid test. If you were a heavy marijuana user, it is possible that it could still show positive in body fluid test. There are also drug tests that use hair. On that test, any substance use in the past 90 days will show up.
Dr. Cynthia Rector
Dr. Cynthia Rector
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