In response , the drug was made illegal three years ago - it is currently graded class c - although it still remains legal for use as an anaesthetic and a horse tranquiliser .

作为回应，这种药物三年前已经有人在非法制作-目前它是c等级-尽管它仍然作为麻醉剂和马匹的镇静剂在合法使用。