JeffT,... true.
I read a story years ago about the Taliban. A group of progressive women met secretly to commiserate about their plight under that oppressive government. In their physical appearance, they were completely “covered”, faces and all. As a group, they gave a video taped interview. One woman laughed somewhere during the interview, and she had a very unique-sounding laugh. Someone who knew her identified her to the Taliban by her laugh. She was tracked down and arrested.