When the return to this state of a person wanted in this state to be tried for a crime is desired, and the person is imprisoned or is held under criminal proceedings pending against him in another state, the governor may enter into a re-extradition agreement with the executive authority of the other state for the purpose of procuring the extradition of the person before the conclusion of the proceedings or his term of sentence in the other state.  The agreement shall be upon the condition that the person extradited will be returned to the other state without further extradition proceedings, upon the request of the executive authority of that state and at the expense of this state.