Ron Gabel, Denver Police Department (CO), Sheri Shimamoto, Lakewood Police Department (CO), Ivanie Stene, Westminster Police Department (CO), and Tom Adair
Abstract: In October of 2004 the authors began a study to examine the possibility of detecting blood in soil over extended periods of time. A sample grid was created on a hilltop at the Highlands Ranch Law Enforcement Training Facility located in Douglas County, Colorado (USA). The sample grid is comprised of six 24â€x24â€ (61x61cm) units in which 500ml of neat horse blood was poured in an â€œXâ€ pattern. Subsequent studies have shown that a recognizable â€œXâ€ pattern persisted up to 16 months and that blood can be detected at the site up to four years following deposition. This paper presents another extension of that detection up to six years.