State flag
It was included in the "Gesetz über die Hoheitszeichen" (Law on the Regional Emblems) of 30 January 1991, which came into law retrospectively to 3 October 1990. The current law, "Verordnung zur Ausführung des Gesetzes über die Hoheitszeichen des Landes" prescribed its use, including banning use by third parties, use of the coat of arms on the seal and use of the arms on the State flag.