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 US Supreme Court uses the process called Judicial Review to see if the laws passed by the Congress and the President are in alignment with the constitution. If they are contrary to the constitution, the laws are declared unconstitutional and are deemed null and void.