I'm not sure how it works in other countries, but in the U.S. you check a little box when you get your driver's license which states on your license whether or not you are a donor. (The new Maryland licenses, for instance, have a cartoonish little red heart on them to signify donor status).
Are you an organ donor? Why or (more interestingly) why not?
And if you're from outside the U.S. and use a different system for determining who's a donor and who's not, please ed-joo-muh-cate me.
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