Opiates/Cocaine: This category includes opium, cocaine, and their derivatives. Opiate derivatives include, for example, morphine, heroin, and codeine. Cocaine derivative include crack cocaine.
Marijuana: This category includes hashish.
Other Drugs: This category includesmanufactured narcotics and includes, for example, Demerol , methadone, and Oxycontin as well as dangerous non-narcotic drugs such as barbiturates, benzedrine, LSD, methamphetamine, and PCP.
Itemized categories may not account for total drug arrests because of occassional reporting irregularities in which arrests are reported for drug abuse offenses but not classified as one of these four categories.
Source: Research & Analysis Branch, Washington Metropolitan Police Department