I was driving back to school today and was merging onto the highway and immediately passed all the cars that I followed on the onramp and of course right when I got out beside all the cars there was a cop. My radar detector didn't go off so I figured I was ok. Well I wasn't. He pulled me over for 72 in a 55 and said he was using radar. I was in uniform and he let me off. Does anyone know if cops are using a different kind of radar that my detector wouldn't pick up? Thanks.