I have a new Redline EX that claims to detect MRCD. However, I've driven under/past several photo carts and it hasn't even chirped. MRCD detection is turned on.

Are the cameras doing something (turning on selectively?) that I'm not aware of? Why wouldn't this detector be detecting the radar? If it's worth anything, I do get a lot of MRCD falsing from BSD signals, so at least there's that...