Quite correct, unfortunately there is no helicopter designed for police or law enforcement purposes from its start on the market. Reason might be that the big money was made with military h/c and helicopters used for offshore oil & gas. And all manufactures thought that the police niche could be easily served in adding some modifications to one of their existing products. Due to the similarity of the missions between military and law enforcement it's not the newsflash of the day that military h/c are basically better to be transformed into police helicopters than helicopters specially designed for offshore transport tasks, like e.g. the H175 or AW189. The modification effort will be lower by far. But as all of the military h/c are designed i.a.w. military certification specifications, and only some of them fulfill civil certification specifications like CS-27 or CS-29 in parallel, you might have the next problem if the police helicopters of a country are civil certified, only.