Witness for the Prosecution
by Kevin J. Lin
At the end of the last century, a General of Puzzlania's army was court
martialed. The accusation was brought forth that a Puzzlanian soldier
had killed an unarmed civilian in an opposing army. The General was considered
responsible for the conduct of all his commands.
The defense had built its case on the possibility that a Puzzlanian civilian
vigilante had killed the civilian. But as it happens, during the war all
soldiers (80% of the populace) wore red uniforms, and all civilians (the
remaining 20%) wore green. A single witness of unquestionable character
had positively confirmed that the killer was in red. Other facts emerged
that eliminated the possibility of a fake uniform, or tricks of the light.
It looked quite bad for The General, until under cross examination it
was revealed that the witness was somewhat color blind. Carefully controlled
tests determined that the witness could correctly tell red and green apart
with only 85% accuracy.
The General smiled smugly, knowing that under court martial rules, he
could only be convicted for his officers' conduct if guilt was established
with 95% certainty. The defense rested.
The prosecution's lawyer stepped up and addressed the Puzzlanian Jury.
What was his response?