Drug test, also known as a substance abuse test, is a technical analysis of a biological specimen (like urine, blood, or saliva) to detect the presence of specific drugs or their metabolites. Drug tests can detect various substances, including:

1. Amphetamines
2. Cocaine
3. Cannabis (THC)
4. Opioids (e.g., heroin, morphine)
5. Phencyclidine (PCP)
6. Benzodiazepines (e.g., Xanax, Valium)
7. Barbiturates
8. Synthetic drugs (e.g., Spice, K2)