What is considered the most common type of biological evidence?

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Blood is considered the most common type of biological evidence due to its prevalence in various crime scenes and its significance in forensic analysis. Blood can provide vital information about a crime, including the identity of potential suspects through DNA profiling, the victim's blood type, and possible connections between individuals involved in the incident. Its ability to retain DNA makes it a critical piece of evidence in criminal investigations.

While other biological materials like saliva, urine, and hair can also yield useful forensic information, blood has emerged as the primary focus in many cases due to its richness in genetic material, and its role in revealing details about the circumstances surrounding a crime, such as whether it was violent or not. This comprehensive utility reinforces blood's status as the most prevalent and significant biological evidence in forensic science.

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