Yep, the Denver task forces (i.e. FRTF, MGTF, etc.) tend to go all over the place working cases and doing surveillance. Denver crime doesn't necessarily stay in or originate in Denver

Morrison used to provide a reasonable amount of wide area coverage for them, but with the simulcast pulling everything in to the City/County, they're coverage-limited. They have used DTRS MAC talk groups in the past for surveillance ops that took them to Ft. Collins or the Springs, but it looks like they've wised up and secured their own talk group and (smartly) encrypted it.
The giveaway here is the 8xxxxxx radio IDs. Those are Denver's.