The Idaho State Board of Education voted unanimously to fight a bill aiming to allow guns on college campuses.
Monday's vote came as trustees voiced concerns that, among other things, the measure could create confusion in the event of a shooting, if more than one person drew a weapon.
Trustee Bill Goesling of Moscow, the University of Idaho's location, fears police won't be able to tell who is the bad guy.
A bill before the Senate State Affairs Committee would allow retired law enforcement officers and people with Idaho's enhanced concealed-carry permit to bring firearms to campus.
A similar measure failed in 2011.
Were it to pass, Idaho would join Colorado, Kansas, Mississippi, Oregon, Utah and Wisconsin in allowing concealed weapons on campus.
Idaho university leaders oppose the effort, too.