Yes, cannabis use can be detected by a hair test.
..............Weed?
Really? Of course
possible if the factors were right.most drugs can difus from sweat into hair but not deposit into hair that will take 10 days
"Cannabinoids" (THC). For example NIDA 5 ( test checks for five categories) include: Cocaine -- Includes Cocaine, Crack and Benzoylecognine Cannabinoids -- Includes Marijuana and Hash Amphetamines...