Hamburg v. State
In Hamburg v. State, 820 P.2d 523 (Wyo. 1991), the defendant was convicted of forging several names on a political petition. With respect to certain signatures on the petition, the handwriting expert testified that the defendant either "very probably" or "probably" forged these signatures.
As this was the sole testimony leading to conviction by the jury, the Court held that the words "very probably" or "probably" could not equate to guilt beyond a reasonable doubt.