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Is it possible? Yes. Is it probable? :shrug: Don't have any way of knowing without either looking at the signal on a spectrum analyzer, unfortunately. If you were able to determine what frequency(ies) the public service agencies are operating on, then you could install a frequency selective filter to attenuate them from the input of your set(s).
For testing, you could use the UHF input of a UVSJ to trap out the VHF band since that appears to be where most of your local police dispatch appears to operate. That would at least give you an idea if interference from the VHF band is the issue.
Unfortunately, many of the other public services use UHF frequencies almost adjacent to UHF channel 14 (450-470 MHz), so filtering them out would be a lot more difficult and you won't be able to pick something up at Radio Shack that will do the trick.
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