Before DNA testing and CSI labs, there was Edward Oscar Heinrich, the man known as the “American Sherlock.” In the early 20th century, Heinrich revolutionized criminal forensics with his pioneering use of fingerprint analysis, bloodstain patterns, handwriting examination, and even forensic botany—solving hundreds of baffling cases across the United States.

From murder investigations and poisonings to high-profile heists and cold cases, Heinrich’s work laid the foundation for modern crime scene investigation. But behind his brilliance was also controversy, flaws in methodology, and cases that raised unsettling questions.

Was he a genius ahead of his time—or a man whose belief in science sometimes went too far? Tonight, we uncover the legacy of the American Sherlock, and the impact he left on both true crime history and modern forensic science.

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