California, United States of America
The following excerpt is from City of Riverside v. Superior Court of Riverside Cnty., E060319 (Cal. App. 2015):
Section 12021 or 12021.1 of [the Penal] [C]ode or Section 8100 or 8103 of the Welfare and Institutions Code. . . . If the department determines that the purchaser or transferee is a person described in [the cited statutes] it shall immediately notify the [gun] dealer of that fact." (Braman, at p. 350; Pen. Code, former 12076, subd. (c).) Held, this language was mandatory and could support tort recovery. (Braman, at pp. 352-354.) Arguably an even clearer case is Morris v. County of Marin (1977) 18 Cal.3d 901, 907 involving a statute that provided that local government entities " 'shall require' " an applicant for a building permit to provide proof of workers' compensation insurance; the court easily held that this created a mandatory duty running in favor of a worker injured on a project where the builder had not obtained coverage.
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