I passed two Missouri highway patrol cars on 70 hwy going about 85. They were going the otherway, not stationary. I got the Ka alert kind of close and I don't think it went over three bars. There were other cars around them and on the second officer my alert didn't start until I was passed him. I know I posted a related message awhile back about whether radar guns "leaked" energy or not so I apologize for the similar new post but this situation really got my attention. Am I picking something up other than a radar gun being in the on mode? Does a Ka gun need to be pointed directly at you to get a full alert? Should I get my detector checked out?