Perjury is dealt with in 193 IPC. Wilful giving of false evidence by a witness while under oath. He can be imprisoned for 7 years. Perjury can be asked leading questions by same side lawyer. HOSTILE WITNESS: Is a person who is supposed to have some interest or motive for concealing pa of the truth, or for giving completely false evidence. REF: Dr. K. S. Narayan Reddys Synopsis of Forensic Medicine & Toxicology 27th edition pg. 7.