P.R. Laws tit. 25, § 2705
(a) If the convening authority disapproves the findings and sentence of a court-martial he may, except where there is lack of sufficient evidence in the record to support the findings, order a rehearing. In such a case he shall state the reasons for disapproval. If he disapproves the findings and sentence and does not order a rehearing, he shall dismiss the charges.
(b) Each rehearing shall take place before a court-martial composed of members not members of the court-martial which first heard the case. Upon a rehearing the accused may not be tried for any offense of which he was found not guilty by the first court-martial, and no sentence in excess of or more severe than the original sentence may be imposed, unless the sentence is based upon a finding of guilty of an offense not considered upon the merits in the original proceedings, or unless the sentence prescribed for the offense is mandatory.
History —June 23, 1969, No. 62, p. 117, § 1204, eff. 90 days after June 23, 1969.