In article ,
wrote:

May I ask:
Legally, in California, in a Post Office, when nobody objects,
is it against the law to snap a photograph or otherwise record
the transaction?

Yes! There is a little know FEDERAL Law from the late 1800's that prohibits
it and is a felony to photograph a postal facility. I'm a professional
photographer for 17 years. Very few people know this and you can
get into some very deep legal trouble if you are actually charged/

then you should be able to cite it.

meanwhile, the us postal service says otherwise.