Amendment VIII

Excessive bail shall not be required, nor excessive fines imposed, nor cruel and unusual punishments inflicted.
 

Robinson v. California, 370 U.S. 660 (1962) (drug addiction)

Powell v. Texas, 392 U.S. 514 (1968) (public intoxication)

Gregg v. Georgia, 428 U.S. 153 (1976) (death penalty) (full text via FindLaw)

Harmelin v. Michigan, 501 U.S. 957 (1991) (life imprisonment without parole) (full text via FindLaw)

Austin v. United States, 509 U.S. 602 (1993) (civil forfeiture) (full text via FindLaw)

United States v. Bajakajian, ___ U.S. ___ (1998) (civil forfeiture)