Good news.
SWAT should have had 4 investigations by now, and unless their investigations are of dead people, they should have some info... even if it's innocent reads that can clear some folks.
Also good news in that to have a team, you need to have more than 1...so, there's more than 1 SWAT member still in play.
As mentioned by LG, assuming that SWAT has good info, one of the agents might consider coming forward (if not today, in the near future). If the Doc hasn't been turned, the open SWAT member should be protected, right? If the SWAT member, for some reason, isn't protected by the Doc, we can assume that the Doc has been turned, and that leaves a pretty clear trail to someone...
Also, SWAT members and Doc... if it looks like you're going to be lynched at any point, claim your role. It doesn't do the town any good to find out afterwards that they've lynched one of the PRs. Don't panic at two votes and spill the beans (as to your role). If it looks like your a goner, though, say something...