Um, yeah, sure.
Let me think of how many conversations I've had at cheif's meetings where it was stated:
"You know, we haven't said over the air - lets go grab this minority and bash his head in yet..., can we encypt our signals so we can say that now?"
Forget 1994, we had DVP (many CT departments have had some form of encyption since at least 1980). The majority of justification was to transmit sensitive information that the public shouldn't hear, usually crime / family related....or even for coffee orders (guilty). Remember, cell phones were not really around/cheap.
With the advent of ADP from Motorola for $10 a radio these days, its a natural specification. Those who think we spend a bunch of money to hide stuff is pretty narrow minded. Recorders for the most part have been digital for awhile and most departments run the fear of getting tapes released. If anything, its voice cell calls to each other than to the dept or over the radio.
Todays equipment also natively supports encyption out of the box for the infrastructure than needing to purchase more specific equipment. Basically, everything is intergrated and/or the cost is not as prohibitive as before.