Section 20N. A person brought into this commonwealth on, or after waiver of, interstate rendition based on a criminal charge shall not be subject to service of personal process in civil actions arising out of the same facts as the criminal proceeding to answer which he is being or has been returned, until he has been convicted or acquitted in the criminal proceeding, and, if acquitted, until he has had reasonable opportunity to return to the state from which he was brought by interstate rendition proceedings or upon waiver thereof.