Section 421.07 - Referral to a DSU Board(1) An inmate may be referred to a DSU Board for possible transfer to a DSU by the Commissioner or his designee if there is a reasonable basis to believe that the inmate satisfies the criteria set forth in 103 CMR 421.09. A referral to, or placement in, a DSU is not permitted for disciplinary reasons.(2) Notwithstanding any rule or regulation of the Department to the contrary, an inmate shall not be referred to a DSU board for committing a specific punishable offense unless a disciplinary board has found him guilty of such offense and has imposed a sanction pursuant to 103 CMR 430.00: Disciplinary Proceedings.