The third of this three part series will provide the student with a two-part discussion around hallucinogens, taking a look at the social context of the drugs and will further differentiate which chemicals are capable of producing hallucinogenic experiences. A two part series on marijuana is also included in this course. The series will identify why most classify marijuana as separate from other drugs, review the behavioral effects of marijuana, the medical interest in it, and concerns that have been raised regarding its use; will explore steroid use, the historical use by athletes, and concerns over steroid use; and will discuss some of the features of substance abuse treatment including its' effectiveness and improvement with regard to the system.