Abuse of central nervous system (CNS) stimulants is common. Addiction to some CNS stimulants can quickly lead to medical, psychiatric, and psychosocial deterioration. Drug tolerance, dependence, and sensitization as well as a withdrawal syndrome can occur.
The judicial branch decides what amendments are unconstitutional as well as acts of the president. However, if the judicial branch were to declare an act of the president unconstitutional, it would mean that Congress agreed to this act.
The U.S. Supreme Court is the final authority on the constitutionality of laws. The U.S. Constitution separates the U.S. government into legislative, executive and judicial branches. Each branch has its own set of powers and responsibilities. The legislative branch passes laws; the executive branch -- headed by the President of the United States -- can either sign or veto laws passed by Congress. However, even when a law is passed and signed, the judicial branch can nullify it by declaring it unconstitutional.