Marijuana has come into the spotlight as a drug that has medicinal powers, but it is a schedule I according to the DEA and cannot be legally used. Even if it is legal from a State Perspective, from a federal perspective, it has no accepted use. Discuss whether you feel practitioners should legally be allowed to prescribe marijuana for patients.
For your citation, you might use articles that show examples of studies that prove or disprove medical efficacy. You can also find articles from experts that discuss the debate.