fruit of the poisonous tree: a rule that once primary evidence is determined to have been illegally obtained any secondary evidence following from it may also not be used
rule of evidence: (law) a rule of law whereby any alleged matter of fact that is submitted for investigation at a judicial trial is established or disproved
psa blood test: a blood test that measures levels of a protein called prostate specific antigen that is manufactured exclusively by the prostate gland; men with prostate problems usually have elevated levels of PSA