The test typically checks for substances such as:
Amphetamines
Cocaine
Marijuana (THC)
Opiates
Phencyclidine (PCP)
Benzodiazepines
Barbiturates
Methadone
Propoxyphene
Hair strands are collected as a specimen for analysis, usually taken from the scalp. Hair samples offer a longer detection window, often spanning up to 90 days, compared to other specimen types.
