The case against him is 'circumstantial'.
a 'circumstantial' account of the meeting
The evidence is purely 'circumstantial'.
(..) whose evidence has not only been called into serious question... on cross-examination... but has been flatly contradicted by the defendant. There is circumstantial evidence to indicate that... Mayella Ewell was beaten... savagely... by someone who led, almost exclusively, with his left. (..)1962 To Kill a Mockingbird