1 sept 1920 año - ≈1920: Edmond Locard, who established a French crime lab predating the first American one, describes his Principle of Exchange.

Descripción:

Locard was permitted by French police before 1920 to start a makeshift attic crime lab (regarded as the first in history!). This led him to discover the Exchange Principle, which states that wherever the human body goes, it leaves behind trace evidence of itself.

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