Are videocameras legal in store changing rooms?

Prompted by tonight’s Family Guy. Are they legal in department stores? Boutiques? Illegal but stores put 'em in anyway? Doing a search, it seems they might be legal (in America, at least, I don’t know about Canada) as long as there’s no audio. Well, what’s the straight dope?

From the website or a company specializing in installing video surveillance equipment:

Some states do allow video surveillance of employee-only changing rooms and the like, provided that employees are notified that surveillance is taking place.

Everyplace I’ve seen 'em, I’ve also seen a notice posted outside the dressing rooms, notifying customers of them.

I don’t know if this is required by law, but it probably could be used in court: ‘notice was provided beforehand, so the customer could decline to use the changing room if they objected’.

I doubt that most states have any laws specifically for this situation. So a customer would have to try to get the store security staff charged under the general ‘peeping tom’ laws. In most states, such laws have language like ‘peeping for the purpose f sexual gratification’. I’d think it would be hard to convince a local D.A. to charge the securit staff at a store under this.

So let me get this straight, there actually might be people watching me undress in the changing room?

How do they make sure the security team doesn’t consist of a bunch of perverts who go back and watch the “girly” tapes every night?

Here in CT, it is explicitly illegal:

Also in RI, which is where Family Guy is set:

Note that what Quagmire was doing would probably not be covered under this law.