(1) except as provided in (2) below, a peace officer may examine a firearm possessed by anyone on the person while in or on a public building to determine whether the firearm is a loaded firearm

(2) a person who is licensed under 166.291 (issuance of concealed handgun license) & 166.292 (procedure for issuing) to carry a concealed handgun may present a valid concealed handgun license to the peace officer instead of providing the firearm for examination