I still have mine in my wallet behind my license, but I have "altered" it.
I keep it there so my Mom and Sister won't go ape shit because I don't have it.
I'm a born-in and have NEVER made copies or given anything to my doctor because I've felt that it was a ludicrous stance and refused to be ruled by it. I figured that, unless it was a planned surgery (I'd have made a conscious decision), in the event of an emergency if the medical staff/emt/doctors weren't informed, they'd just try and save my life by any means necessary before my family or any other witlesses could get involved and stop them.
I am now trying to draft something that I can give my doctor to allow them to give me blood, secretly; in other words give me blood but don’t let them see you do it or find out about it. I want to make my wishes known in my medical records because I do want my parents to have DPA but not when it comes to decisions concerning blood. I’m not exactly sure how I’m going to do this, but I will discuss it with my doctor and an attorney so it will be ironclad, effective and hopefully completely confidential.