Legal Question in Employment Law in California

This is almost certainly unlawful. California Labor Code Section 435 states:

"(a) No employer may cause an audio or video recording to be made of an employee in a restroom, locker room, or room designated by an employer for changing clothes, unless authorized by court order.

(b) No recording made in violation of this section may be used by an employer for any purpose. This section applies to a private or public employer, except the federal government."

Thus, unless there is a Court Order authorizing audio or video recordings in the restroom, locker room, or changing room, it is unlawful conduct.

Restrooms? No. That is an invasion of privacy, protected against.