Juries in criminal trials do not base verdicts on uncorroborated testimony given by any one witness  Rightly so, because it is usually prudent to be highly skeptical of unsubstantiated claims made by any one person
But then, to be consistent, juries should end an all-too-common practice: convicting defendants on the basis of an uncorroborated full confession
Many people believe that juries should not convict defendants who have not made a full confession.