Yeah. He was dead.
“...False positives — people whom the examiner says are “deceptive” but who are in fact telling the truth — are more common than false negatives — people whom the examiner says test “not deceptive” but who are in fact lying. Of one study situation Lykken says, “An accused person who is innocent who takes a polygraph test has almost a 50-50 chance of failing it.” Says Lykken, “Those odds are worse than Russian roulette!”
Moreover, two examiners looking at the same polygraph charts will not always agree on what they mean. In fact, one study found that 10 to 20 percent of the time the same examiner may read the same charts differently if he reads them after a six-month interval...”
http://www.salon.com/2000/03/02/polygraph/
(see also Daubert Standard)
Sorry, I meant about the officer being treated.