6 doctors weighed in:

When do doctors test for THC in blood and urine?

6 doctors weighed in
5 doctors agree

In brief: Various reasons

To test for street drugs that may be affecting health.
To determine if someone is abstinent from addicting drugs, including cannabis. Also, many pain management specialists require drug screens for patients receiving opioid pain medications.

In brief: Various reasons

To test for street drugs that may be affecting health.
To determine if someone is abstinent from addicting drugs, including cannabis. Also, many pain management specialists require drug screens for patients receiving opioid pain medications.
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