Not that I have firm info but with everything else moving to DesertSky (OpenSky) I'm sure that vice and other special ops are using the digital system now for privacy.
Aha! check 419.500 MHz, listed at a federal narcotics channel in the DB for Clark County.... some activity there... no enough yet to get a clear definition, but heard it in the past doing some vice type stuff.
NARC on 419.500 and heard the same group of users on 155.115 briefly. Nothing since two weeks ago on .115. And cannot find vice now anywhere; so M142, you're probably correct.
Only a few old freqs are working for Metro, the new digital system is broke and there is a new-new p25 system on the way (maybe?) There was a post about new radio license applications. What's left is 158.79/159.15/419.5/851.375 [065 dcs] still able to monitor.
I kept 155.115 in my scanner and it was silent until I left LV about a week ago. I have moved to Taiwan and working the W7AES DStar repeater ... if anyone is interested.
The LVRAC had a presentation about Metro's plan. Most important is that the radios in the cars and the handhelds already have P25 capability; but NOT the repeaters. So their plan (at the moment) is to replace the repeaters ... but need a lic for them. P25 IS scannable, but not with most scanners.
Unknown. My latest scanner is Pro-107, it can't do P25. Just read the book on the '164. It should say.
Here is the issue. ... P25 modulation is NOT analog FM, it is PM digital, you can read more about it online. The digital encoding is not normally encrypted, but can be ... easily, requires radio with the capability; or external encrypting/decrypting hardware.