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.
Each branch restrains the other from becoming too powerful through checks and balances. The executive branch can veto a passed law from the legislative, while the legislative branch can cancel that veto with 2 thirds vote from both houses of congress and the judicial branch can decide if a law is unconstitutional.