I went to the Philip Morris website once to get a coupon for cigarettes http://www.philipmorrisusa.com/en/home.asp and before they would mail you a coupon you had to enter your drivers license number, name, address, etc. I had recently moved and I used my new address. I was declined. I logged back in and used my old address and was approved. Keep in mind that this is real-time. So I suppose they could use it to verify your name, age, address, etc.

Trey