Check out these amazing airless tires:

http://www.fastcoolcars.com/airless-tires.htm

Look at the picture of the car in motion. You can actually see right thru the tire. These tires are scheduled to be out on the market very soon.
The bad news for law enforcement is that spike strips will not work on these.
Just think of the impact on existing technology:
A. no more air valves...
B. no more air compressors at gas stations...
C. no more repair kits...
D no more flats...
These are actual pictures taken in the South Carolina plant of Michelin.