D.C. Mun. Regs. tit. 16, § 1504
1504.1 The Director may join several cases against a single respondent or group of respondents in one petition if the Director determines that the various cases to be joined involve the following:
1504.2 The Administrative Law Judge may disallow joinder if the following determination is made:
SOURCE: Final Rulemaking published at 33 DCR 6176, 6177 (October 10, 1986).