Drug Enforcement Administration ranks controlled substances according to five "schedules." Marijuana, along with drugs like heroin and LSD, is a Schedule I drug, meaning it is considered to have the highest potential for abuse and be the "most dangerous." More from NBCNews.com: Alaska Becomes Third State to Legalize Marijuana Washington Has More Pot Than It Can Smoke Pot Vending Machines Dispense Weed Because alcohol and tobacco are legal, they are not controlled substances, and not subject to DEA scheduling
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In other instances, especially for more serious offenses, a person may be on supervised probation, which could require active monitoring, completion of programs, and random drug testing