Unfortunately, I don't think any of this will come into the trial...unless Snotty himself takes the stand.
Dev, what do you think??
We know the defense would object strenuously... for starters, they'd say his behavior at this present time is too remote in time and place from the date of the murder (which they don't even concede was a murder.)
But the prosecution could counter that his behavior at this place and time is bound up with the trial concerning Laci's murder, and that that makes it relevant to the murder itself.
The prosecution would have to prove, with handwriting experts, that the handwriting was Scott's.
I think they have half a shot at getting it in, regardless of whether Scott testifies. (PS If Scott testifies, that, all by itself, is very likely to make him lose the trial.)