Introduction
Over the past decade, drug crimes and drug abuse have garnered a lot of attention. It is estimated that every year about $110 billion is cost to the country through drug related accidental injuries and deaths, health care, criminal behaviors, dependency treatment and so on. Both the state and federal laws prohibit the manufacturing, possession, and the sale of certain controlled substances such as cocaine, heroin, methamphetamine, marijuana, and ecstasy. Drug's relation to crimes is through the effects drugs make on the user's behavior by influencing him to commit violence and other illegal action connected to drug trafficking. In 2004, ...