jan 1, 1902 - Locard's Exchange Principle was Discovered
Description:
Locard's Exchange Principle states that every time a person comes into contact with another person, place or thing, trace physical materials are left behind and taken with them. It also states that it is impossible to perform a violent act of crime without leaving some form of evidence.Added to timeline:
Date:
jan 1, 1902
Now
~ 123 years ago