Some questions from a newbie..

I am located in Southern California (LA AREA) I have done some research and found out that LAPD (Los Angeles Police DEP) has gone digital if i am not mistaken. I dont do much highway travel, its mostly street travel. I have been looking around and i am wondering is there a scanner that can tell me if there is a cop (car, motorcycle) within a certain radius of me. I looked into the handheld RS Pro-96. It is digital. What do you guys suggest i should get. I dont think a CB would be apropriate since i dont do much highway. I just want to be able to locate or be aware there are cops within a certain radius of me.