Story error?

Rating: 10/10 (3 October 2019)

Not a spoiler but a ?
Well the whole movie was compelling but noted something
forgotten how good it was when i first saw it 25 years ago
but perhaps a missed fact or?
Well when they couldn't find the gun thrown in the river to identify and compare
to crime scene,
yet they found bullets and broken glass where his car was,
wouldn't those bullets at his car be different from the ones at the crime scene
....would have proved his story
but other than than,
unless he was deliberately framed by someone
but it doesn't even touch on that...