You might arrange an outline like this:
I. Contents of drugs
D. Compare contents in strength, nutritional value
II. Effects of drugs
D. Compare biological effects of these drugs; human actions while using these drugs.
III. Present your argument for changing one to Schedule II.
Much of what you put into an outline is dependent on your instructor's directions for length and research requirements. This is an outline in which I would expect the Roman numerals can represent paragraphs and the capital letters are chunks of sentences within the paragraphs. However, if you have a longer research requirement, the Roman numerals could be sections of your paper and the capital letters could be paragraphs.