(a) If, during the actual term of imprisonment of an inmate in the department, the inmate commits an offense or violates a rule of the department, the department may forfeit all or any part of the inmate’s accrued good conduct time or, in accordance with the policy adopted under Subsection (c), place all or any part of the inmate’s accrued good conduct time in suspension. The department may not restore good conduct time forfeited under this subsection but may reinstate good conduct time suspended under this subsection.