Key decisions of this term show a willingness of some justices to reject political leaders' judgments.
The historic 5 to 4 ruling says the right to bear arms applies to individuals.
The case involved a California man who killed his ex-girlfriend after she complained to police.
In a 5-to-4 ruling, the justices decide child rape isn't a capital offense.
In a ruling Thursday, it guides federal judges to weigh conflicts of interest by insurance companies.
Justices rule 7 to 2 that some defendants aren't competent enough to represent themselves.
The US Supreme Court ruled 5 to 4 Thursday that those held in Guantánamo can challenge their detention.
Two high court rulings on Monday will complicate US efforts to prove certain crimes.