Unless you live in an area that uses X band radar frequently(Iowa, for example), you can pretty much dismiss X band alerts.
The local PD in my town uses K and Ka and occasionally lidar. The same goes for the Sheriffs department and State Police, which are also using aircraft on certain stretches of roadway, which is where the scanner comes in handy. In addition, I have encountered a NM Commercial Vehicle enforcement officer using lidar as well.
