Of all the 'professional' people on this board, pray tell where would one hide such a device in the lav? The size of an iPhone would be realistic, plus some kind of mount, even be it double sided tape. Practically all surfaces of the lav are plastic plates secured to the bulkhead. Apart from actually drilling those and assembling a camera behind them, there is no realistic location where such a device could be placed quickly and without prohibited tools... Some people should really first think what is possible and realistic before going all panic mode about a reasonably impossible situation...