I suggest you read the US Justice Department DAG memo 8/29/13 that outlines their stance on state's rights on marijuana enforcement. The Controlled Substances Act of 1970 (signed by Richard Nixon) categorizes marijuana a schedule 1 drug, defined as a "drug" that has a high potential for abuse and no medicinal value. First off, marijuana is a plant, if I buy or grow a plant, it's none of the government's business whether I eat or smoke it. Second, it's very widely accepted that marijuana has a very wide array of medicinal and therapeutic value, so this is an absurd scofflaw. If you look at the list of drugs on schedule 1, these are all plants and substances that were widely used and accepted by the anti-Nixon movement and the Black Community. The CSA was used as a tool to scare the public and incarcerate Nixon's opponents. It's time for change.