(a) The Governor, Lieutenant Governor, State Treasurer, Secretary of State, Auditor of Accounts, Attorney General, and members of the General Assembly and officers and witnesses whose duty it is to attend thereon, in all cases except treason, felony, and breach of the peace, shall be privileged from arrest and imprisonment during their necessary attendance on and in going to and returning from the General Assembly.

(b) A party or witness in a cause pending in any court in the State or before special masters, auditors, referees, or commissioners, and a witness in a criminal cause pending in any such court, shall not be arrested, imprisoned or detained by virtue of civil process. Any witness summoned from outside the State in a criminal cause, pending in any court within the State, shall be privileged from the service of papers of any kind whatsoever, and from arrest for any cause while going to, attending at, or returning from such court or trial of such cause.