In April 2014, the Texas attorney general issued an opinion about whether school districts may authorize employees or trustees to carry concealed handguns at school board meetings or on school property when a sporting event or interscholastic event is taking place.
The attorney general noted that several Texas school districts have adopted policies that allow designated employees to carry handguns on school premises. This type of policy, sometimes called a "guardian plan," is authorized by state law and requires that the designated individuals be properly licensed.

However, a different law prohibits a person from carrying a handgun to board meetings, high school sporting events and other interscholastic events. The question the attorney general was asked to consider was whether a person who was a designated “guardian” and was authorized to carry a handgun pursuant to board policy could still violate the other law by carrying a handgun to the specified events.  
The attorney general said that a district-appointed “guardian” acting under a “guardian plan” may lawfully carry a gun to school board meetings, sporting events and interscholastic events because the “guardian” is acting according to school board regulations and authorization, and thus would likely be acting within the scope of official duties.
Under the same opinion, the attorney general also determined that a school district could appoint one person to serve as a school marshal and another person to serve as a “guardian.”
Although attorney general opinions are not binding law, they are considered to be a useful indicator of how a court would likely interpret the law.