They have to. I mean legally they cannot consider that evidence. If they keep bringing it up in jury deliberations, and that gets reported, it would be a mistrial.
However, you’re right in that it cannot be erased from a person’s mind… the phrase I’ve heard used is “ringing the bell” which is when a lawyer might mention a persons prior convictions, but that gets objected to and stricken. But the bell rung and the jury knows.
They don’t. But later in deliberations they cannot see it in a transcript. They are supposed to base everything on the evidence they have.
So, if something is said that absolutely incriminates a person, but it’s thrown out on a technicality and little evidence remains… technically they should be not guilty.
Conversely, if someone is being railroaded for a crime and the only evidence placing them half way across the world at the time is somehow thrown out…. They’d have to find them guilty.
Unless, like me, you got it for $49.
Still, jellyfin.