Mafia 107. Fever and Overdose

I can be permanently kept under blocks/isolations until it becomes obvious that I am peaceful.

And who are you after that statement? If your isolation automatically demonstrates your peacefulness, then you are probably the role that someone else here is trying to portray. Why not execute them?
If it's not automatic, but rather requires a long period of observation during the day, then it's probably a hint about a test/game, right? Of course, it's possible, but agree that such a hint is convenient for the Mafia. However, permanent isolation of a Town member doesn't seem like a beneficial strategy for the Town.