After the war, several employees of the companies that had supplied Zykon B to the SS in the concentration and extermination camps were brought before the court in a number of criminal trials. The first trial, of employees of the Hamburg distributorship Tesch & Stabenow (TESTA), was held before a British military court in Hamburg from March 1 to 8, 1946. The owner of the firm, Bruno Tesch, and his coworkers Joachim Hans Drosihn and Karl Weinbacher were charged with having wittingly supplied the Zyklon Bused in the German concentration camps to murder citizens of the Allied countries. The defendant Joachim Hans Drosihn was acquitted in the proceedings because he was given no insight into corporate policy. Weinbacher and Tesch, on the other hand, were found guilty of knowingly supplying Zyklon B to murder human beings and were condemned to death.