<prompt> Lee-jones test is used in which poisonPhosphorusCyanideMethyl alcoholCopper  <response>: Test for cyanide Lee-jones test : Few crystals of ferrous sulphate is added to 5 ml of gastric contents. To it, 5 drops of NAOH is added. The mixture is boiled and cooled. 10 drops of 10 HCL is added to it. Greenish blue color indicates cyanide and purplish color indicate salicylates. Ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 473 