Chances are, you are scanning in "ID Search" mode instead of "ID Scan" mode.
Does the display show "ID Search" while scanning?
To change modes, press "FN" then "Scan"..
This will ensure that you only scan the TGID's you entered.
Yes - as a matter of fact it's at the base of my "stack".
I used to take it with me on the road and enjoyed literally thousands of hours of enjoyment and most nights fell asleep with it running.
I use to have the Air Force 1 frequencies in it and could monitor unsecure phone calls when Bush...
Nope. As a matter of fact, sometimes it is only on one end of the transmission.
Some agencies switch it on and off at will.
It can be switched on during an incident or to conceal tactics or details of the incident.
Any answer you get here is going to be complete speculation, unless it is from the vendor or a person who is "in the know".
People like to speculate, but the answer is, "You never know".
Why not just enjoy it while you are able. The world isn't coming to an end - yet.