A murder bag is a forensics kit used by police officers at crime scenes. It was developed by Sir Bernard Spilsbury, a British forensic pathologist known for his work on the Hawley Harvey Crippen case in conjunction with Scotland Yard in 1924. The subsequently produced kit was carried by all detectives responding to a homicide, and contained rubber gloves, tweezers, evidence bags, magnifying glass, compass, ruler and swabs. The kit changed as needed to keep pace with changing advances in forensics.