(a) The board of trustees of each school district shall determine the appropriate number of armed security officers for each district campus. The board must ensure that at least one armed security officer is present during regular school hours at each district campus.
(b) A security officer described by Subsection (a) must be:
(1) a school district peace officer;
(2) a school resource officer; or
(3) a commissioned peace officer employed as security personnel under § 37.081.

(c) If the board of trustees of a school district is unable to comply with this section, the board may claim a good cause exception from the requirement to comply with this section if the district’s noncompliance is due to the availability of:
(1) funding; or
(2) personnel who qualify to serve as a security officer described by Subsection (a).
(d) The board of trustees of a school district that claims a good cause exception under Subsection (c) must develop an alternative standard with which the district is able to comply, which may include providing a person to act as a security officer who is:
(1) a school marshal; or
(2) a school district employee or a person with whom the district contracts who:
(A) has completed school safety training provided by a qualified handgun instructor certified in school safety under § 411.1901, Government Code; and
(B) carries a handgun on school premises in accordance with written regulations or written authorization of the district under § 46.03(a)(1)(A), Penal Code.
(e) The board of trustees of a school district must develop and maintain documentation of the district’s implementation of and compliance with this section, including documentation related to a good cause exception claimed under Subsection (c), and shall, if requested by the agency, provide that documentation to the agency in the manner prescribed by the agency.