Blood can be crucial evidence at crime scenes

August 22, 2009 5:33 PM

Blood left at a crime scene can be like a witness to the crime.

For the right investigator with a background in bloodstain pattern analysis, blood — where it’s left, what it looks like and how it’s splattered — tells a story.

“It’s just like a painting,” said SBI Assistant Special Agent in Charge Peter “Duane” Deaver, who is considered an expert in bloodstain pattern analysis. “It’s been painted there for me to interpret.”

Bloodstain pattern analysis is a science based on physics, geometry and trigonometry. It requires research, practice and willingness for an investigator to admit, “I don’t know.”

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