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 Court would not declare another act of Congress unconstitutional until 1857, and it has used that power sparingly. But through its role as arbiter of the Constitution, it has, especially in the twentieth century, been the chief agency for the expansion of individual rights. (See Part V.)