According to the database, EMS TGs are not encrypted. I don't listen to them so I cannot tell you from experience. However, I do know that the Hamilton County Fire OPS channels in the clear.
(Sorry to hijack the thread)
Have the TG numbers changed? I have the DB from Sentinel (which comes from RR) loaded into my 436 and even when I manually tune an Ops TG after dispatch (I.e. "Engine 381 on Ops 301") I hear nothing. Not LSM distortion or anything as I hear LEO and fire dispatches clearly.