The cold hard truth is that the driver's license does not impact the holder's donation.

In every single case of death the decision to donate rests firmly on the Next of Kin's (NOK's) shoulders (click here for more on NOKs). 

Although a person's driver's license indicates he or she wishes to donate, procurement organizations will always follow the wishes of the NOK.

The only instance in where a driver's license will be used is if the holder has no NOK.

Having the signature and sticker on your driver's license is, however, wonderful advertising for the donation 'cause'.  Every time you present your license to write a check, verify your identity or verify your age, the person looking at your license will see that you are an organ, eye and tissue donor.  It just may cause that person to consider his or her own decision regarding donation.

And contrary to what some belive, having the sticker and signature on your license will NEVER cause emergency medical services to not do everything in their power to save your life.  No medical professional will ever allow an organ, eye and tissue donor to pass away simply for the purpose of procuring organs, eyes or tissue for transplantation.

The way Chris put's it is this:  Why would a doctor allow you to die just to use your organs and tissues? When you die, your account is closed and he won't make a single dime off you.  Keeping you alive, though, will ensure his income for the rest of your life.