On the final day of the term on Thursday, the Supreme Court’s three most conservative justices announced the day’s three blockbuster decisions — starkly affirming their power to determine the outcome of the nation’s most contentious legal disputes.

First it was Clarence Thomas calmly announcing in Board of Education of Independent School District No. 92 of Pottawatomie County v. Earls, No. 01-332, that wide-scale drug testing of public school students was not a Fourth Amendment violation.