An Arkansas school district that trained more than 20 teachers and staff to carry concealed handguns on campus through a program that faces questions over its legality was wrong to make secret the names of the employees, the state’s top attorney said Monday.

Attorney General Dustin McDaniel said in an advisory opinion that the Clarksville School District was incorrect to withhold the names of the employees it had trained to work as volunteer, armed security guards. McDaniel last week said that the state board in charge of regulating private investigators was wrong to license the western Arkansas district as a private security firm under a little-known law the school had used to arm its employees.