the time defendants start serving their sentence, they know, based on the up front award of the maximum allowable amount of good time credit, their prospective release date. Because the award of good time credit under section 1253(3) is expressly conditioned upon observance of all rules of the Department of Corrections and the particular penal institution where a defendant is in custody, however, id., deductions may be made from the up front award for misconduct or criminal behavior. Id. at § 1253(6) (Supp.1995). Thus, despite the up front award, there is always a possibility that deductions will be made and defendants will serve the full length of their original sentences rather than the sentences as shortened by the up front award. 7 . See Bossie v. State, 488 A.2d 477, 479 (Me.1985)
holding that a retroactive application of section 17a mrsa  12533 calculating good time for criminal defendants already in custody was an unconstitutional usurpation of the governors commutation power holding retroactive application recognizing that the application of a retroactive amendment is discretionary holding no retroactive application holding that section 92434 could be unconstitutional in application