When a violent crime occurs, blood evidence is found at the crime scene. Bloodstain pattern analysis is a subfield in forensic science that utilizes blood evidence to reach a conclusion about a crime. The shape and convergence of bloodstains can infer the murder weapon and origin of attack, which is crucial when reviewing witness statements. However, analyst error sometimes results in inaccurate conclusions. This review will focus on how blood is detected and classified and include certain factors that may affect blood appearance. Current classification methods will be discussed as well as new, emerging methods. Future research into analytical methods could allow blood pattern analysis to become a more reliable area of forensic science.

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This work is licensed under a Creative Commons Attribution 4.0 License.