A previous poster was correct when they said that lo-jack installs the receivers in police vehicles and aircraft for free and they retain ownership. They then remove the equipment when the police vehicle goes out of service.
In recent years they have drastically ramped up use in southern border areas and ports. I know almost all of the border sheriff's departments, DHS, and border cities have at least 1 lo jack unit in Texas now.
Almost all of the Texas DPS choppers have them now as well.
It really just depends on what part of the country you are in. In the Northeast lo-jack has a very good presence, in the southeast there are significant gaps in LE coverage due to so many rural areas.
Ive used lo-jack myself and it works better when more than one patrol car is tracking the signal and when the target is stationary. If a target is just passing through a city on a highway a signal will appear then go away with no time to figure out where it is.
The first target I had was a stolen bob-cat tractor which was parked in a garage at a business. It took about 30 minutes with two patrol cars to narrow down the location, which allowed us to get a search warrant.
So much of what lo-jack does now are motorcycles, boats, and especially heavy equipment like bulldozers.