No, I don't work for Union County. I have a few friends who do work for Union County and I basically had them transmit on the various channels and noted the talk group ID #'s.
the talk group 1045- belongs to the Sheriff's Department Fugitive Unit, which goes out and hunts down suspects who fail to appear in court and have warrants. This may be why you hear whispering and they would be doing some basic surv. to see if there suspect is at home.
The talk group 0777, i haven't come across yet.
but there are a lot of talk groups many of which are not law enforcement. Also, since the sheriffs officers work inside court rooms, you may hear them whispering so not to disrupt court proceedings.
But i can give you some basic info to figure out who the ID's belong to.
If you are using Dec. format,
County Police fall within 500-590 range
County Prosecutors fall within 200-350 range
County Sheriff fall within the 1000 - 1050 range
If you are using the AFS format
County Police are 04-xxx
County Pros are 02-xxx
county sheriff are 08-xxx
The County Police and County Prosecutors Office are fully aware that they can be monitored, so for Investigations and confidential transmissions they use Digital channels which can not be monitored.
The County Sheriffs do not really get involved with investigations, so they do not have digital channels that I know of. Also, for the most part, only the Fugitive unit works at night and then only to 11 pm, the sheriffs office are off on holidays and weekends, so their talk groups will be very quiet during these times. The Sheriffs K-9 unit is on call anytime past 8 pm and do not patrol, only respond when assistance is requested.
So your best bet is to listen to the County Police & Pros.