The case against him is 'circumstantial'.
a 'circumstantial' account of the meeting
The evidence is purely 'circumstantial'.
(..) Look, there was one alleged eyewitness to this killing. Someone else claims he heard the killing, saw the boy run out after, and there was circumstantial evidence. But those two witnesses were the entire case for the prosecution. Supposing they're wrong? What do you mean? What's the point (..)1957 12 Angry Men