On the Supreme Court, there are conservatives and there are conservatives. Former chief justice William H. Rehnquist and Justice Antonin Scalia are each usually labeled as “conservative.” Yet on Fourth Amendment issues, they can seem quite different. Take Rehnquist’s record. During his 33 years on the court, he participated in 38 cases that decided Fourth Amendment issues by 5-4 votes. Thirty of these cases rejected the defendant’s claim. And Rehnquist cast the deciding vote against the …