The Supreme Court on Monday upheld the police practice of taking DNA samples from people who have been arrested for a serious offense but not convicted of a crime, ruling that it amounts to the 21st century version of fingerprinting. The ruling was 5-4. Justice Antonin Scalia, a conservative, joined three of the court’s more liberal members — Justices Ruth Bader Ginsburg, Sonia Sotomayor and Elena Kagan — in dissenting. The five justices in the majority ruled that DNA sampling, after an arrest “for a serious offense” and when officers “bring the suspect to the station to be detained in...