Moldy Bread/Matzah found in a box which had held both at various times: Pesachim 7a
Fear that an animal may transfer Leaven to a place which has been checked: Pesachim 9a-b
Assuming that a rodent ate the Leaven which it was seen carrying: Pesachim 9a
Where a rodent took 1 of 10 pieces, where 9 of them were Matza: Pesachim 9b
Where rodents took from 2 boxes, one of Leaven and one of Matza, into 2 houses: Pesachim 9b-10a
Where it is not known whether the rodent entered a house with the Leaven: Pesachim 10a
Where a rodent took Leaven into 1 of 2 houses: Pesachim 10a
Where one checked after the rodent, and couldn't find the Leaven: Pesachim 10a
If one checked and found Leaven, but he can't verify that it was the rodent's Leaven: Pesachim 10a
If one put out 9 pieces of Leaven, and found 10: Pesachim 10a
If one put out 10 pieces of Leaven, and found 9: Pesachim 10a
If one put Leaven in one corner, and later found it another location: Pesachim 10b
If a Rodent was carrying Leaven, and crumbs were found, are they from the same Leaven: Pesachim 10b
If an infant was carrying Leaven, and crumbs were found, are they from the same Leaven: Pesachim 10b
If a Rodent entered and left with a piece of Leaven, are they the same: Pesachim 10b
Above case, but it was clearly Another Rodent which left with Leaven, is it the same Leaven: Pesachim 10b
If a small rodent entered with Leaven, and than a larger rodent left with Leaven: Pesachim 10b
Above case, but the larger rodent was carrying Leaven and the Small Rodent: Pesachim 10b