[Turk]

A few years ago, fellow Ham Radio Operators were succesfully building and operating radar jammers.
They were improved upon to be able to dial in the speed you wanted indicated on the radr gun. This is going back about 10 years or so.
They would be compatible with the speed recording technology of that day. I doubt it they would work with the current generation of Radars and lasers etc..

I also believe one of the more enterprising Hams went into commercial production with his little black box. Aplicable laws then allowed for the ham to experiment, but not to sell it commercially.
I believe they sold many , and either the laws were changed by FCC, or the technology left him behind.

TURK