Thank you, stmills for that information!
I may be able to add a small bit of information to your list.... I am not 100% certain on this but I believe "BLM PD TAC 10942" and "BLM PD TAC 10944" are the encrypted TAC talkgroups for Bloomington Police. Not to be confused with their original TAC talkgroups "BLM PD TAC 1 10936" and "BLM PD TAC 2 10938".
I noticed the Bloomington Police talking about going to their encrypted TAC channels if things start to get serious during the Floyd Riots last summer. This was not for BPD officers helping MPLS PD.... this was for BPD protecting the major businesses within their own city.
Since then I have also noticed one of my scanners picking up encrypted radio transmissions on normal business days. I suspect these are detective or other sensitive talkgroups conduction their daily work.
So from what I can tell, BPD has at least two encrypted TAC talkgroups, and at least one (probably more) talkgroups for other sensitive departments.
Thanks again for your reply.