Virginians can add their blood type to their driver's license or state ID
www.nbcwashington.com
Virginians can now choose to add a blood type indicator to their driver’s license, a move that will help first responders determine what kind of blood to use for transfusions more quickly in an emergency.

I think this is a great idea but I can also see how some may view this as intrusive or a slippery slope with regard to personal medical information.

Any downsides to this I might be overlooking?