[Gaffer]

I saw a TV report on this. Pretty neat, but very expensive ($5000 per each unit installed)....shoots out of the front bumper behind a flap door.

It looks like the cop has to get about 20-25’ from the perp to fire it.

[raybbr]

It looks like the cop has to get about 20-25’ from the perp to fire it.

So, the cops gotta chase the guy so he don't have to chase him anymore? Got it.

[Gaffer]

This is not the same TV report, but you can get the gist of what it does. They say in this spot the cost is $250 each and good for one use. This is just for the projectile.
The tracking stuff and launcher are in the other range I mentioned.

http://news.cnet.com/8301-17852_3-57609416-71/police-firing-gps-tracking-bullets-at-cars-during-chases/

[Revelation 911]

pretty neat until the perp realizing he's been tagged, carjacks an innocent family

No disrespect meant but this is a stupid idea

[Ruy Dias de Bivar]

This is not a new idea.

I saw a news report, about 25 years ago, where cops cut a hole in the floor of their cop car, and set off a homemade rocket propelled devise designed to “short out” the electronics of the speeding car ahead. You had to get close, but it worked.