Umno president Ahmad Zahid Hamidi has been acquitted of all graft charges in relation to the Foreign Visa System (VLN).<br /><br />Shah Alam High Court judge Mohd Yazid Mustafa today ruled that the prosecution had failed to prove a prima facie case and its three key witnesses were unreliable.<br /><br />The witnesses were former Ultra Kirana Sdn Bhd (UKSB) administrative manager David Tan Siong Sun and former UKSB directors Harry Lee Vui Khiun and Wan Quoris Shah Wan Abdul Ghani.