I think you guys have some level of confusion.
A "CAD" system is a computerized assisted dispatch, it has absolutely nothing to do with the type of radio system, the frequencies, trunked, conventional. I hope you get the picture.
A "CAD" system is used by a lot of agencies for reporting purposes, it can issue case or "cad" numbers as they are sometimes called depending on the department protocol.
In a number of places the standard is a "cad" number is used for something the say an officer rolls up on like a disabled vehicle, a malfunctioning traffic signal. A case number is used for a crime ie: burglary, theft etc. This is set by individual department policy and is by no means an absolute standard.
I hope that clears up that concern.
Time to think about going digital. Where are the 700 scanners?