Blood Stains

What does Blood Stains mean in American Law?

The definition of Blood Stains in the law of the United States, as defined by the lexicographer Arthur Leff in his legal dictionary is:

Stains left by blood, the identification of which is important in many criminal actions. Once “set,” blood stains are longlasting and almost impossible to remove because they are in effect the rust stains left by the iron compounds in the blood. If reasonably recent, a great deal about the source of the blood can be scientifically determined, including not only what species it belonged to, but even sometimes which individual animal. See blood test.