"This may well be a legal situation without precedent. The Court will withhold ruling on the objection for the time being."
The next defense witness was a specialist on agglutination of the blood.
"Agglutination," he explained, adjusting his glasses pedantically, "is a biological reaction consisting of the mutual adhesion of the red corpuscles. It is also a method of establishing individualization of blood."
"I see," said Jake. "Now, tell us—how has this method been used to establish identification in a criminal case?"
"It is sometimes used where the victim's blood leaves stains on the murderer's clothing—as well as the victim's own clothing. If both blood stains produce the same biological reaction, the murderer is either guilty—or has a great deal of explaining to do!"
Jake meticulously selected another exhibit from the material on his desk.
"Will you identify this, please?"
"It is a piece of cotton stained with the blood of this—this defendant."
"When was it stained?"
"In the test I made last week."