The director of public safety shall have authority to establish a state firearms training and qualification standard for retired law enforcement officers carrying concealed firearms pursuant to 18 U.S.C. § 926C of the Law Enforcement Officers Safety Act of 2004, and shall promulgate rules for the implementation of this state standard as required by 18 U.S.C. Section 926C(d)(2)(B). Any rule or portion of a rule, as that term is defined in section 536.010, that is created under the authority delegated in this section shall become effective only if it complies with and is subject to all of the provisions of chapter 536 and, if applicable, section 536.028. This section and chapter 536 are nonseverable and if any of the powers vested with the general assembly pursuant to chapter 536 to review, to delay the effective date, or to disapprove and annul a rule are subsequently held unconstitutional, then the grant of rulemaking authority and any rule proposed or adopted after August 28, 2005, shall be invalid and void.