Sentence:  `` Unfortunately '' , says Chief Postal Inspector David H. Stephens , who has prosecuted many device quacks , `` the ghouls who trade on the hopes of the desperately ill often cannot be successfully prosecuted because the patients who are the chief witnesses die before the case is called up in <WSD>court</WSD> '' . 
Meaning of the word marked with <WSD> tags:  an assembly (including one or more judges) to conduct judicial business