I'm a security officer, working at various locations, and I carry my GRE PSR-800 scanner while on foot patrol or in my vehicle when on duty. I also have my Alinco DR-150T 2m mobile mounted in my vehicle, although I never turn it on unless I'm on break.
I have found that it increases my situational awareness, and has allowed me to avoid traffic issues and get to where I need to be on time.
A couple of times, law enforcement officers looking for someone who ran from them were nearing my position and I contacted their dispatch and informed them of my presence. They told me to stay in my vehicle and informed their officers, who made contact with me and thanked me for doing so. I told them that I dislike report-writing as much as they do.
73,
Richard, NW7OR