Toyota and Nissan are said to be testing ignition interlock devices that would test alcohol through the palms of its drivers. This style of alcohol testing is known as transdermal alcohol concentration, or testing for alcohol through perspiration. We are all waiting in anticipation to see how these tests go. If tests go well their plans are to introduce these devices as OEM equipment on all vehicles, at least in some markets to start. I will keep an eye on this and update when new information it is available.