The case in question this week involved a man named David Baust, who was charged in February with trying to strangle his girlfriend. The Virginian Pilot reports that Baust's phone might contain video of the conflict but that his phone was locked with a passcode. Baust's attorney argued that passcodes are protected by the Fifth Amendment.
The judge agreed with Baust, though he noted in his written opinion that “giving police a fingerprint is akin to providing a DNA or handwriting sample or an actual key, which the law permits,” the Virginian Pilot reports. “A passcode, though, requires the defendant to divulge knowledge, which the law protects against.”
For the nefarious: Settings > Touch ID & Passcode > turn off option for iPhone Unlock.