 NEW YORK--BUSINESS WIRE--Halper Sadeh LLP, a global investor rights law firm, is investigating whether GW Pharmaceuticals plc NASDAQ: GWPH and its board of directors violated the federal securities laws andor breached their fiduciary duties to shareholders in connection with the proposed sale of GW Pharmaceuticals to Jazz Pharmaceuticals plc for 200.00 in cash and 20.00 in Jazz ordinary shares for each GW American Depositary Share ADS. On behalf of GW Pharmaceuticals shareholders, Halp 