The number of exceptions to the hearsay rule are ridiculous. I suggest taking a look at the Federal Rules of evidence. 801-807 cover hearsay and the exceptions for it's use. I agree that it probably won't get mentioned in court - although for reasons other than it being hearsay - but there may well exist a valid exception for it that would allow it to be entered into evidence. Just wanted to correct that small misconception that hearsay always equals bad unusable evidence.