D.C. Mun. Regs. tit. 17, § 2421
2421.1 A notary public may refuse to perform a notarial act unless refusal is prohibited by a law other than this chapter.
2421.2 A notary public, other than a notary public acting pursuant to a commission from the federal government, may refuse to perform a notarial act if the notary is not satisfied that:
(a) The individual executing the record is competent or has the capacity to execute the record; or
(b) The individual’s signature is knowingly and voluntarily made.
SOURCE: § 25.4 of Regulation No. 73-13, approved May 24, 1973, as published at 19 DCR 1147 (June 11, 1973); as amended at 25 DCRR § 25.4; as amended by the New Columbia Statehood Initiative and Omnibus Boards and Commissions Reform Amendment Act of 2014, effective May 2, 2015 (D.C. Law 20-271; 62 DCR 1884 (February 13, 2015)); as amended by Final Rulemaking published at 69 DCR 012856 (October 21, 2022); as amended by Final Rulemaking published at 70 DCR 014646 (November 3, 2023).