Garco Jail
272592 is definitely a Jail Unit.
8929 surprisingly is in the Clear and seems to be the primary Jail Ops TG
8930 I've seen some affiliations with, but haven't caught any traffic yet (all by jail radios)
8931 is definitely a Jail TG, but is encrypted full time.
I'm wondering if 8930 might not turn out to be a transport TG, especially given if it's being seen in other parts of the the state. 8929 is busy with lots of traffic (open doors, move prisoner, taking to medical, meals, etc.), so I suspect they wouldn't want to pull that traffic with them to busy sites.
I'll try to catch some traffic on 8930 and see what I can find. It doesn't look like it's had much activity on it so far, which might also lean towards a transport tg.
Chuck