Your testimony at the parole hearing would be admissible in a subsequent proceeding (hearing). As to whether or not your case will be reopened and new charges added depends on whether or not it would constitute double jeopardy.  Double jeopardy means you can't be tried twice for the same offense.  However, it is not double jeopardy if your second trial would include a different offense because the new offense includes additional elements that were not part of the original charges. Additional elements would mean it is not the same offense. Even if it appears to be the same offense, it is not double jeopardy if you are tried by separate sovereignties such as being tried on federal charges and state charges.  Whether or not your case is reopened and new charges added also depends on the decision of the district attorney.It would be advisable to speak with a criminal defense attorney.