(a) Any paroled inmate who has been returned to any institution of the Department of Correction for violation of such inmate’s parole may be retained in a correctional institution for a period equal to the unexpired portion of the term of such inmate’s sentence at the date of the request or order for such inmate’s return less any commutation or diminution of such inmate’s sentence earned, except that the Board of Pardons and Paroles may, in its discretion, determine that such inmate shall forfeit any or all of such earned time, or may be again paroled by said board.

(b) Each parolee or inmate, subject to the provisions of § 18-7, shall be subject to loss of all or any portion of time earned.

(c) Any person who, during the service of a period of special parole imposed in accordance with subdivision (9) of subsection (b) of § 53a-28, has been returned to any institution of the Department of Correction for violation of such person’s parole, may be retained in a correctional institution for a period equal to the unexpired portion of the period of special parole. The total length of the term of incarceration and term of special parole combined shall not exceed the maximum sentence of incarceration authorized for the offense for which the person was convicted.