You can’t use this to drive yet. No police department is said to accept Apple Wallet ID. So it’s a no-go, you must have the plastic. Though some states have their own app. However even if they have their own app they don’t necessarily make it legal to only drive with their app on your phone, you must still have the plastic ID on you when you drive.
So in some limited circumstances, there are states with their own app, that you can legally drive with, without having the plastic ID. In a wreck, they could look for any possible identification you have on you or in the car, including but not limited to credit or debit cards, other ID cards, the registration you legally must have in the car (if it’s not your car they can call the owner and ask who drove), then when they get your identification they can actually call the DMV and get your organ donor registration.
Also Apple Health app actually has Medical ID with organ donor status as a field you can fill out. Your Medical ID can be presented automatically with crash detection. It’s not necessarily linked to your legal registration, but I’m sure if you filled it out with “I am an organ donor” and it turned out you weren’t an organ donor, then I guess the hospital would get a “good faith” exemption from the law that they saw sufficient evidence you were an organ donor, simply because you filled it out that way. Similar if you filled out other fields wrong and it came back to bite them, ie you put in not-real conditions and they treated you for those conditions, medical providers do get “good faith” provisions in situations like that.
