[timdierks]

At least in NY, I don't see how this is possible because I can send in an absentee ballot and then invalidate it by voting on election day in-person. So I don't see how they can open any of the secrecy envelopes, let alone count any ballots, until they've determined if the ballot in the envelope should be counted, and they can't do that until they get the poll book back from my election site at the end of in-person voting. (But maybe NY is one of these 8 states due to this rule?)

[DennisP]

Yep I'd guess NY is one of the eight. In NC they process in advance, and if I vote with both methods, they arrest me for a felony. The state attorney general and BoE had to point that out to everyone after Trump suggested people try it.