Students in Mr. Robert Marino’s forensic science class were introduced
to Locard's exchange principle during a recent lab. A pioneer in
forensic science, Dr. Edmond Locard believed that when a criminal or
person came in contact with an object or person, a cross-transfer of
evidence occurred. Mr. Marino asked students to wear a clean T-shirt
that was washed separately for one day and then packaged in a Ziploc
bag. The students were tasked with examining each shirt for any
fragmentary transfers of fibers, hairs, wood shavings, metal filings,
tidbits of paper, or any small, lightweight item that adheres to the
donor object.