I am in the middle of מחלוקת with someone as to, if I originally had a חזקה and now there's a ספק to whether that status is still true, whether I maintain that original status or my status changes to something else.
Example: In (נדה דף ב ע״א) it discusses a case where a woman finds blood today (present) but the last time she checked herself was a week ago (past). Do we say retroactively she is considered טמאה from her last examination or do we say she keeps her previous חזקה and from this point on she's טמאה? In short: Is she impure from her last examination (which makes everything she touched since then impure) or is it from now on she's impure?
- שמאי says she's impure starting now but she's considered pure since her last examination till now since we aren't positive her status changed till this moment.
- הלל would say she's impure from back then since we have to assume she was impure the second after she examined herself last time (a week ago).
But then the Gemara says, הלל only holds this way because it's normal for a woman to go through cycles and so we have to assume at some point naturally she was going to become impure and therefore we must assume it naturally happened right after her last examination, otherwise – if we can't assume that the status would change naturally at some point – he would hold like שמאי.
This was one example. But I'm looking for more examples that would back up or disprove this notion that you maintain your previous status until we are positive your status has changed. And once we are positive, only from that point on do you have this new status, not retroactively.
Are there other examples of חזקה העשויה להשתנות where even though there's a ספק we hold that he maintains his previous status until we know for sure he fits into a new category?
Does it mention somewhere that this idea is a blanket rule, that we always maintain his original status unless proof that he's for sure the other way around/ something else?