PCP may contain contaminants and be impure, causing the color to range from tan to brown, and the consistency to range from powder to a gummy mass.
Most heroin supplied to the United States is from poppies grown in Colombia and Mexico.
Opiate use brings about an intense euphoria, or rush, that lasts only briefly and is followed by a few hours of a relaxed, state of contentment.
The clandestine laboratories that produce analogues of fentanyl for illicit consumption often mix other drugs with fentanyl and sell it to consumers to make a quick buck.