Any unsubstantiated testimony of witness is not the basis for jurors to make a judgment. Because in general, it is wise to highly suspect that anyone has no evidence for litigation requests, but jurors should not trust their common experience in order to be consistent that declare the defendant guilty based on all unconfirmed confessions.
For those accused of crimes and easy to be hinted, it is difficult for them to determine their memories of the past, so they finally accept accusations against them supports the above view.