Cannabinoids Testing

Examples: Marijuana, hashish, hash oil

Medical uses: Treatment of nausea and vomiting due to cancer chemotherapy.

Effects attractive to abuser: Euphoria, intensified sensual and
aesthetic perceptions.

Adverse effects: Paranoia, panic, impairment of memory and ability to
perform tasks, distorted perception of time, physical and psychological
dependence.

How abused: Smoked in cigarettes or pipe; occasionally eaten as
ingredient baked into confections.

Typical urine detection cutoff level: 100 ng/mL or 20 ng/mL (optional)

Period detectable after last dose: This is highly variable. A one joint
per week user has detectable levels of cannabinoids form 7 to 34 days,
while a heavy daily user may be detected from 6 to 81 days after last use.

Substances causing false positive results: none reported. A screen
detection cutoff level of 20 ng/mL, requested by some laboratory clients,
may produce false positives due to passive inhalation of marijuana smoke,
but this is controversial.

At the cutoff level of 100 ng/mL, persons exposed passively to the smoke
of others by virtue of being in the same room with abusers should be
negative on urine drug screen, although more sensitive chemical techniques
(such as gas chromatography/mass spectrometry, which has a sensitivity of
10 ng/mL) may demonstrate the drug in such an individual's urine.