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.
Only the President, head of the Executive branch, has the power to veto legislation. The Supreme Court (Judicial branch) can use judicial review to declare challenged legislation unconstitutional, nullifying a law, but is not the same as a veto. Congress had the power of Legislative Veto until the Supreme Court declared the practice unconstitutional in INS v. Chadha, (1983). Congress and the President still cooperate to use an informal variation of this rule. Only the President, head of the <b>Executive branch</b>, has the power to veto legislation.   The Supreme Court (Judicial branch) can use judicial review to declare challenged legislation unconstitutional, nullifying a law, but is not the same as a veto.