The U.S. Supreme Court has ruled in a narrow 5-to-4 decision that police can collect DNA samples from people they arrest even before they are convicted of a crime. The ruling upholds a practice already in use in most U.S. states where DNA samples are collected by cheek swab and used to solve crimes. In a dissenting opinion, Justice Antonin Scalia wrote, “Because of today’s decision, your DNA can be taken and entered into a national database if you are ever arrested, rightly or wrongly, and for whatever reason.” Some advocates for rape victims voiced support for Monday’s ruling, saying DNA evidence is the best tool available to prosecute sexual violence.