Publication Year


Bloodstain Pattern Analysis

From: Lawyer's Guide to the Forensic Sciences


Discusses bloodstain pattern analysis, providing a thorough overview of the science of bloodstain pattern analysis, as well as its role in criminal cases. The chapter also provides a case study and legal analysis that focuses on cases including Langlet, Newman and Hurtado.



Patrick Laturnus

Patrick Laturnus, RCMP S/Sgt. (Retired), is an acclaimed forensic crime scene specialist who has been doing this work since 1975, specializing as a Bloodstain Pattern Analyst in 1990. He retired from the Royal Canadian Mounted Police with thirty-one years of service and then became a full-time instructor at the Ontario Police College for six years. He presently works as a private consultant in Ottawa, Ontario, which entails criminal casework as well as teaching on an international basis. Mr. Laturnus was responsible for establishing a training program that has certified people as qualified bloodstain analysts not only in the province of Ontario, but also in other provinces as well as internationally. He has written several bloodstain-related articles and has appeared on radio and television to discuss his work. His international work was recognized when he was designated a Distinguished Visitor by the Government of Singapore. He is the proud recipient of the Amethyst and Ovation awards from the Government of Ontario, as well as the winner of the Foster Award, which is the highest honour bestowed by the Canadian Identification Society. The ultimate recognition, as a bloodstain analyst, was being awarded the honour of Distinguished Member of the International Association of Bloodstain Pattern Analysts.

Caitlin Pakosh

Caitlin M. Pakosh, HBSc, JD, has been working as case management counsel of Innocence Canada (formerly known as AIDWYC) since 2012 and is responsible for managing the Association’s cases across Canada. She obtained her honours bachelor of science degree, specializing in forensic anthropology and earning a minor in biology, from the University of Toronto Mississauga in 2008. Her undergraduate thesis, which examined the decomposition of dismembered pig limbs enclosed in plastic bags and submerged in Lake Ontario, was conducted during her internship with the Toronto Police Service Marine Unit and published in the Journal of Forensic Sciences in 2009. Ms. Pakosh obtained her Juris Doctor degree from the University of Calgary in 2011. She has appeared in the Court of Appeal for Ontario and has worked on intervener and appellate cases that have appeared at a variety of levels of court, including the Supreme Court of Canada, as well as ministerial review applications. Since 2013, Ms. Pakosh has cross-examined forensic science students in annual mock trials at the University of Toronto Mississauga, where students practise being expert witnesses. She is a member of the Criminal Lawyers’ Association and the National Association of Criminal Defense Lawyers. She is also an associate member of the American Academy of Forensic Sciences and the Canadian Society of Forensic Science.