Assuming Status Quo based on the Last Known Case

Certainty vs Possibility

"Stand the item upon its established status [Haamaid al Chezkato]": Niddah 2a-4b
"There are 'legs' to this assumption [Raglayim laDavar]": Sotah 2b, 3a; Niddah 3a
Weighing the status quo versus single or multiple aspersions which are cast upon it: Niddah 2b-3a
In issues of impurity, it is assumed that items were in the same state as they are now, at the time of their initial contact: Niddah 4a, 56a

The case of a woman who is suspected, based on a witness, of adulterous behavior: Niddah 3a
Moldy Bread/Matzah found in a breadbox, after/on Pesach: Pesachim 7a
Money found in a box/location which had regular money and Secondary Tithe Money: Pesachim 7a
Money found in Jerusalem, or before merchants: Bava Metzia 26a
Status of [retroactive] impurity for a woman who sights menstrual blood: Niddah 2a-7a, 9b, 15a
Status of [retroactive] impurity for a woman who finds a menstrual bloodstain: Niddah 3a, 4b-5a
Assuming that one's wife is not menstruant, if she was menstruant when he was last aware of her status: Niddah 11b, 15a-b, 16b
A Ritual Bath which was found to be lacking the necessary amount of water: Niddah 2b [2x], 3b
When produce which was used for multiple separations of Tithes is discovered to be rotten: Niddah 2b, 3b
Destroying Terumah, where the majority of cases would be impure but there is a previous, verified status of purity: Niddah 18b
The status of a person who touches a crawling creature, and is unsure whether it was from an impure species or not: Niddah 4a
The status of an item on which a formerly impure utensil is found, when it is unclear whether the utensil or the item was capable of communicating or contracting impurity at the moment of their initial contact: Niddah 4a
The status of a loaf of bread on a shelf, where a lenient form of impurity ["Madaf"] is found beneath the shelf: Niddah 4a-b
The status of olives on which a burnt crawling creature is found, so that it is unclear whether it had been burnt before it contacted the olives or not: Niddah 4a, 56a
When a crawling creature which can communicate impurity is discovered in an alley: Niddah 3a, 3b
When a crawling creature which can communicate impurity is discovered in a house: Niddah 4a
When a crawling creature which can communicate impurity is discovered in a box: Niddah 3b-4b
When a crawling creature which can communicate impurity is discovered in a pail: Niddah 3b-4a


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