Do these systems to stop cars by interfering with electronic ignition not already exist? I'm sure I've read about this technology for many years. From a quick s

Do these systems to stop cars by interfering with electronic ignition not already exist? I'm sure I've read about this technology for many years. From a quick search I found a 2010 article: http://tech.slashdot.org/story/10/01/22/2339204/ http://tech.slashdot.org/story/10/01/22/2339204/ Is this one of those technologies where prototypes keep getting demonstrated but never produced? Edit: an unreliable source from 2004: https://groups.google.com/d/msg/alt.law-enforcement.traffic/pA_UKdDG3uQ/Su3SrB50igMJ https://groups.google.com/d/msg/alt.law-enforcement.traffic/...