https://www.army.mil/article/180593/last_uh_1_huey_a_42_year...
The UH-1 was developed as a medevac helicopter for the US army.
SAR, medevac, fire fightings etc. are all roles that the Blackhawk is perfectly suited for and all for which it has dedicated variants.
As for law enforcement use again I don’t see a problem with it, the use of them is mostly restricted to very special cases (FBI/DEA etc) due to cost of both the aircraft itself and the operational costs.
The Mexican federal police is indeed essentially an army at this point since they engage in paramilitary operations against the cartels.
On the other hand Cobras have no use other than to spray a target with their auto cannon or missiles.
So I was really curious what police force in the US or anyone is operating attack helicopters.
As for Blackhawks I’ve never seen them used by police forces, those in civilian use are not surplus military helicopters or even the UH-60 but rather it’s civilian version the Sikorsky S-70 which are used by fire departments and search and rescue crews.