Never had a cut off switch but back in the day before cell phones and when all LEO used radio I made "rum runs" to Juarez several times with my MG and Lotus cars. On one trip in the Lotus I ran by FOUR stationary highway patrol radar cars in CO and NM at 105-125+ mph and was never pursued. Sheesh, and was sweating it for miles....
Once, I was pursued by an Arvada patrol car on Wadsworth but neatly evaded due to some elan maneuvers. Now I drive Toyotas and don't try that shit anymore.