And maybe she hasn't. But she also failed a polygraph, said Lt. Dan Jungles of the Will County Sheriff's Office. Darlene Crosby blamed this on the police's “tactics.”
Besides, Lakerisha Crosby also failed the lie detector test, Jungles said, and so did someone else he declined to identify. For whatever that's worth. Psychology Today apparently doesn't believe it's worth much.
“Although polygraph machines look scientific and measure responses such as sweating and increased pulse rate with exquisite accuracy, they are crude in their conception,” said a Psychology Today article that compared the polygraph to an “ancient Arab ordeal for detecting liars.”
“In the Arab test, a heated knife blade was pressed to the subject’s tongue,” the story said. “If he was telling the truth, his tongue would not get burned. The idea is that when people are nervously excited, their mouth goes dry because nervousness suppresses salivation. In principle, the lie detection system involved is exactly the same as for a polygraph test.
Whether the lie detector tells you anything or not, Jungles said Darlene Crosby was definitely less than truthful when she told of the police's lack of interest in speaking with her.