And you would probably win....ask 10 cops and you will get 10 opinions. Ask 10 local courts, etc..
This law was written many years ago, probably before CB and definitely before scanners, and leaves much to be desired.. It should be re-written to cover the issues we are discussing in today's world. As for now, if a person has a valid amateur radio license and has a "radio capable of receiving police frequencies" I would let him go on his way. BTW, what is a radio capable of receiving police frequencies? Is it a scanner with police frequencies programmed in it, or one that CAN have them programmed in it, but does not. Is it still capable of receiving police frequencies? Also, what are police frequencies? Years ago the FCC allocated certain frequencies and designated them as police frequencies, or local government, or emergency medical and school buses ( I never understood that one!), or business, utility, fire, etc. Now all those frequencies are labeled "public safety". The law is outdated.