The Fourth Amendment prohibits searches without a reasonable suspicion to justify them. When an individual is arrested, law enforcement officers routinely fingerprint and photograph prisoners for identification purposes. Suppose a police department proposes adding a new procedure to its prisoner intake routine for prisoners arrested in connection with a serious crime: taking a DNA sample via a cheek swab. Such samples could then be submitted to a national crimes database for a potential match to unsolved crimes. Is obtaining the DNA sample without a search warrant a violation of the prisoner’s Fourth Amendment rights?