Thanks for teaching me a new term. Had to look that one up: Fruit of the poisonous tree is a legal doctrine according to which any secondary evidence obtained indirectly through illicit means is inadmissible in court. Examples of such sources include evidence gained through eavesdropping, illegal wiretapping, coercive interrogations, unwarranted searches, or improperly conducted arrests.
Had to look that up...
“Fruit of the poisonous tree is a legal metaphor in the United States used to describe evidence that is obtained illegally. The logic of the terminology is that if the source (the “tree”) of the evidence or evidence itself is tainted, then anything gained (the “fruit”) from it is tainted as well.”—Wikipedia