Me. Rev. Stat. tit. 15, § 2164

When a convict has been pardoned on conditions to be observed and performed by the convict, and the warden of the State Prison or keeper of the jail where the convict was confined has reason to believe that the convict has violated those conditions, such officer shall forthwith cause the convict to be arrested and detained until the case can be examined by the Governor, and the officer making the arrest shall forthwith give them notice thereof in writing.