[ImPostingOnHN]

> If the cops accuse me of shooting someone in SF, but I was in Berkeley at the time, I might be tempted to tell them that. But then, when they produce a faulty eye-witness, who says they saw me in SF that evening, suddenly I need to discredit that witness in order to resolve my alibi.

you have an equal need to disprove the claims of a witness regardless of whether you have an alibi

additionally, regardless of whether there's a witness, all you need to do is prove you were in Berkeley to remove yourself as a suspect

so the two things (alibi, witness) seem orthogonal

[Mawr]

You don't, because the witness testimony is irrelevant on its own. Without knowing the alibi, there's no reason to think the OP being in SF is an issue at all.

See https://youtu.be/d-7o9xYp7eE?t=1255