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... he threads, made a copy, and photographed them.
For the average trace examiner, extracting fingerprints from a round object is already quite challenging. It is akin to turning a curved surface into a flat one. Jiang Yuan once dealt with a cold case involving fingerprints on the crossbeam of a bicycle. Due to substandard extraction techniques, it made identification difficult.
Extracting fingerprints from threads was even more difficult, but fortunately, the threads were very fine ...
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