"Vehicle Disabling Systems". US Department of Transportation: Federal Motor Carrier Safety Association. Archived from the original on 21 February 2013. Retrieved 13 February 2013.
espacenet.com
worldwide.espacenet.com
US patent 8254902, "Apparatus and methods for enforcement of policies upon a wireless device"
"Vehicle Disabling Systems". US Department of Transportation: Federal Motor Carrier Safety Association. Archived from the original on 21 February 2013. Retrieved 13 February 2013.