On January 1, 2016, Texas became the 45th state to allow the open carry of firearms. This affects most private employers, with exceptions for schools and certain areas of oil and gas refineries. Private and public businesses that wish to prohibit the carrying of concealed and/or openly carried firearms must display, at every entrance to their premises, the following signage mandated by Texas Penal Code § 30.06 (regarding concealed handguns) and/or § 30.07 (regarding openly carried handguns):