What does any of that have to do with the story here? The tracking device wasn't added by the police or even at the behest of the police, but by the buy-here-pay-here dealer, operating a business of the same respectability as payday lending and rent-to-own stores, who expect their customers to default. This wasn't done for cops but for repo men.
By all means complain about a violation of privacy, but it isn't by the state. Rather this is the result of a financial system that promotes, aggravates, and profits off of poverty.