General Order on the German Salute issued by the Reich Ministry of Justice [Germany]: “No. 349- The German Salute is the greeting of German citizens. When dealing with judicial authorities, in particular in court sessions, Jews are therefore not allowed to use the German salute.”
Deutsche Justiz. Rechtspflege und Rechtspolitik. Amtliches Blatt der deutschen Rechtspflege 1937, page 1760. Translated by Franziska Wagener 3/8/2016