Medical cannabis
Most recently, in "Gonzales v. Raich" (2005), a California woman sued the Drug Enforcement Administration after her medical cannabis crop was seized and destroyed by federal agents. Medical cannabis was explicitly made legal under California state law by Proposition 215, despite cannabis being prohibited at the federal level by the Controlled Substances Act. Even though the woman grew cannabis strictly for her own consumption and never sold any, the Supreme Court stated that growing one's own cannabis "affects" the interstate market of cannabis. In theory the product "could" enter the stream of interstate commerce, even if it clearly had not been grown for that purpose and was unlikely ever to reach any market (the same reasoning as in "Wickard v. Filburn"). It therefore ruled that this practice may be regulated by the federal government under the Commerce Clause.