Before the sun rose, the informant donned a white Islamic robe. A tiny camera was sewn into a button, and a microphone was buried in a device attached to his keys. 

 

The undercover FBI informant - a convicted forger named Craig Monteilh - then drove off for 5 a.m. prayers at the Islamic Center of Irvine, where he says he spied on dozens of worshipers in a quest for potential terrorists.