The deal supersedes the use of that testimony as evidence. If there is OTHER evidence, that obviously can be used against him.
However, in Pennsylvania at least, for this particular instance of sexual assault, the statute of limitations has run out.
If there are other jurisdictions with other statutes of limitations, and enough evidence, he could be charged somewhere else. Likewise, if there is evidence in Pennsylvania for other, more recent assaults he could be charged with those.
He was in jail after being found guilty of a single sexual assault. Foe that one crime, he will not face any further consequences.
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