You trust states that can't even clean their voter rolls to check other databases to validate whether the person who cast their vote is still living? Judicial Watch has been pursuing Maryland, for example, to turn over their voter rolls for years. From personal experience, I don't trust government agencies to notify each other of the recently deceased in a timely fashion absent action by those who survive the decadent.
Also, nice sleight of hand-- multiple manners of fraud have been alleged. While you do well in investigating the one that you could hope to directly verify (though your methodology is wanting), you perform a sleight of hand that makes this alleged method the only method alleged, then talk about how difficult it would be to produce the entire fraud product using that particular method.