Call me suspicious, but if this was ACTUALLY about the teacher sharing confidential information, then that'd be what they'd all be screaming and making the biggest (justified!) fuss about. Not this whole 'OH NO, VAGINAS!!!' crap. Sounds like they're just grasping at straws and accusing the teacher of doing even worse shit just to discredit or demoralize him--possibly in the hope that, whatever the outcome of the investigation, the teacher will either be chased from the school or resign.