It does not follow that evidence which is not, in itself, admissible, cannot lead to a proper conviction. If the police find evidence because of hearsay, that evidence may yet be admitted though the hearsay itself would not be. If a paper tells the police that they have got information by tapping a phone and the police go to the suspect and interview him or her, or find incriminating evidence as a resut of that information, it does not follow that the court will automatically exclude the evidence found.After all, if the source did not reveal how or why he knows or believes what he says ("I've heard rumours", "There's a story going around ") that would result in the standard police evidence "acting on information received, we went to.."which defence counsel unfortunately hear all the time in court, and which is never queried (largely because doing so invites the admission of very dangerous hearsay; "his wife told us", "a well-known criminal told us he knew")