You guys are funny. You think Law Enforcement is like in the movies. Unlimited budgets and computers that show you the fingerprints with cool noises as they check them.
I was thinking the same. When real-time GPS tracking was less ubiquitous I used to manufacture / sell battery powered devices with magnets etc that sent in data by GPRS. I had a few guys from the local undercover division visit for a demonstration to see how my $1.5K device compared with their $10K "law enforcement only" device that used a continuous data call that cost over $500 a day in comms costs.
Anyway they found it to be technically superior, just they couldn't use it because I sold it to anyone with the cash, a practice I wasn't going to change just for a few sales to them
. Actually one of the best customer groups were jealous / suspicious partners that wanted to save the cost of a PI.