Gray was reluctant to take action against Farran, believing he could use some information produced from Rubowitz by Farran to crack the Lehi in Jerusalem. Gray believed that arresting Farran would ruin these efforts. While Gray was on leave in England, the acting CID commandant, Arthur Giles, ordered an investigation into Farran's actions. Farran escaped to Syria to avoid arrest, but was convinced by Fergusson to return voluntarily. He then escaped from custody and went to Jordan before again returning of his own accord. He was brought to trial in a British military court in Jerusalem.