I read he dismissed the charge AFTER he was taking into federal custody
A state judge in Boston cited prosecutorial misconduct in dismissing a case against a man after he was taken into federal custody in the middle of his criminal trial last week.
www.nbcnews.com
And the article describe it was mid-trial, so the trial had not been concluded
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He can't be removed (or in legal term "Deposed") in the court proceeding if it was "His" trial until the case is concluded, and that action left no other option but for the judge to dismiss the case because he can't answer it in Federal Custody. Which mean what the Fed did to him is unconstitutional, and he can ask for a Criminal Justice visa to testify against the agent (Which will lead to Permanant Residence) and the court will have to give it to him. Not to mention the lawsuit he may file for civil right violation..