The main argument of USA suing the Cooperative. The United States of America on its side presented a tremendously weighty argument that deals with the law of the country in the first place. The mentioned above Controlled Substances Act is a certain prohibition concerning narcotics, which has been made by experts and considered to be a law. Ordinarily, there is no exception from the law that already exists; it is similar to the situation when the fact of not knowing a certain law does not release from the responsibility for its violation. The argument of the case was related to the possibility to make an exception concerning the Controlled Substances Act prohibitions. Oakland Cannabis Buyers’ Cooperative implied that marijuana is medically necessary for a definite group of people and the USA’s government considered this to be a violation the Controlled Substances Act. The “degree” of marijuana’s necessity in medical purposes was point that caused the majority of the questions throughout the case. The Court was supposed to “solve the problem” and announce its verdict.