Yes, I have noticed that LPD uses them a lot.
I was always hearing LPD say get me a hook then disp: Jims is in route. I was hoping to get them into my communication loop so that I could hear them paging the driver
I actually have heard quite a bit on 461.9500 today, but was never able to follow Officer-to-DISP-to-Jims-to-Driver, so they must be using something else as well. retro is most likely correct.