fruit of the poisonous tree
n. in criminal law, the doctrine that evidence discovered due to information found through illegal search or other unconstitutional means (such as a forced confession) may not be introduced by a prosecutor. The theory is that the tree (original illegal evidence) is poisoned and thus taints what grows from it. For example, as part of a coerced admission made without giving a prime suspect the so-called "Miranda warnings" (statement of rights, including the right to remain silent and what he/she says will be used against them), the suspect tells the police the location of stolen property. Since the admission cannot be introduced as evidence in trial, neither can the stolen property.