Detectives Used Trickery to obtain confession in Martin Tankleff's Case

How far will some unscrupulous detectives go when trying to solve a case?

In the case of Mr. Tankleff, who was 17 at the time of his parents’ murders and who quickly recanted his confession, one detective’s ruse had an especially dramatic flair. He faked a phone conversation with a hospital worker that Mr. Tankleff could hear, saying, “No kidding, he came out?”

The detective then told Mr. Tankleff that his father had regained consciousness briefly and had identified his son as his attacker. The performance was so convincing that another detective testified that he believed the call was real.

Should these detectives face some sort of sanction? Let's weigh in on this behavior.