Evidence, broadly construed, is anything presented in support of an assertion. This support may be strong or weak. The strongest type of evidence is that which provides direct proof of the truth of an assertion. At the other extreme is evidence that is merely consistent with an assertion but does not rule out other, contradictory assertions, as in circumstantial evidence.
It is the duty of the Judge in criminal trials to take care that the verdict of the jury is not founded upon any evidence except that which the law allows.
John Duke Coleridge, C.J., Reg. v. Gibson (1887), 18 Q. B. D. 537; 16 Cox, C. C. 181.