Why blood? If you're trying to use DNA then a spit sample would do just fine.
I think the easiest thing for the USA to do is to create a national holiday for voting. The biggest reason poor and young people don't vote is because you can't leave a job that pays you hourly for half a day when you're barely getting by as it is.
A spit sample would work...mouth swab...something...anything...and you're right...it should be at least a weekend event... if not a holiday!
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I like the way voting works in Australia much better. Voting is mandatory and a federal holiday. If you require everyone to vote, you have to find a way to make it easy and secure.
https://en.wikipedia.org/wiki/Elections_in_Australia
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