The California DOJ as well as the Federal Bureau of Investigation require that the personal identifying information and criminal justice information be encrypted or not shared via any means that may result in it falling into the hands of anyone other than those who have a legit need for it.OK... here's my $0.02. Nowadays, radio traffic is widely retransmitted over the internet. My belief is this new way for anyone to listen in without even having to invest in a scanner has contributed to police departments feeling the need to encrypt. I don't think there would be nearly the need for encryption if people HAD to spend five or six hundred dollars to listen in.
Doesn't matter if it's over the internet (delayed or not) or via scanner (no matter how much they cost).