Me. Rev. Stat. tit. 34-A, § 3073

Notwithstanding any other provision of law, transportation of a prisoner between a correctional facility and a court in connection with the prosecution of the prisoner for a crime committed within a correctional facility is the responsibility of the department, unless the department and the sheriff agree that the sheriff will undertake the responsibility of the transportation at an agreed-upon rate of reimbursement to the county by the department.