D.C. Mun. Regs. tit. 7, § 227
227.1 In accordance with §11 of the Act [§36-310, D.C. Code, 1981 ed.] and §2(1) of the Act [§36-301(12), D.C. Code, 1981 ed.], the employer with the last known exposure shall be liable to pay compensation for occupational disease.
227.2 The employer shall not be liable for any occupational disease which results from a hazard to which the worker has had greater exposure outside of the employment.
SOURCE: Notice of Final Rulemaking published at 41 DCR 3213 (June 3, 1994).