Here in South Africa the "camera fine" has been perfected. Best of all; once you receive a summons and post off a check (cheque in SA!) it often isn't banked and next thing you are arrested at a roadblock on an outstanding warrant for a traffic offence. It happened to me on a Sunday morning and, unless you pay the full amount in cash, you remain locked up with company whose credentials are unknown / questionable, until you appear in court the next working day . Guaranteed checks not accepted, credit card not accepted - do not pass begin but proceed straight to jail... In theory you can remain locked up for more than 2 days if they grab you on a Friday evening, without knowingly or wanting to have avoided paying the fine and for a traffic offence or parking ticket!!! And if you don't have the cash with you, you aren't going to be taken past an ATM to draw money either!!!
Anyhow I have no idea whether this is legal or not where you live, you would need to check that, but without accepting any liability, or recommending these products, I found these links a while back:
http://www.bimmerparts.net/laser/flashphoto.html; http://www.photobuster.com/