Ruling on a matter that has divided the courts, a federal judge held law enforcement officials do not run afoul of the U.S. Constitution when they force people to use their biometrics to unlock their smartphone devices.In a written opinion last week, U.S. Magistrate Judge Sunil R. Harjani authorized a search warrant allowing authorities to compel Anthony Barrera to scan his fingerprints and thumbprints to unlock his iPhone.Prosecutors suspect Barrera made threats against a confidential informant in his criminal case on …