fruit of the poisonous tree
In US law, any secondary legal evidence that has been obtained as the result of unconstitutional or illegal means or information gathered in such a way. Such evidence, both the primary source and the secondary result, are generally inadmissible in court. The police were found to have obtained the knowledge of the illicit firearms' location from a search they conducted without a warrant, and thus this fruit of the poisonous tree was ultimately not admitted during the prosecution.