As the Brooklyn homicide detective Louis Scarcella told it, the suspect in a ruthless home invasion that left one man dead and two more people in a coma started talking after just a few minutes of questioning.

“You got it right,” the suspect, Jabbar Washington, said. “I was there.”

The phrase was straightforward and damning, introducing the central piece of evidence that sent him to prison for 25 years to life. At the 1997 trial, Mr. Scarcella told the jury that it was the easiest confession he had obtained in more than two decades working for the Police Department.

But if the interrogation was unique for him, the wording was not. In at least four more murder cases, suspects questioned by Mr. Scarcella began their confessions with either “you got it right” or “I was there.”

Mr. Scarcella, 61, was a member of the Brooklyn North Homicide squad who developed a reputation for eliciting confessions when no other detective could. But questions about his credibility have led the Brooklyn district attorney’s office to reopen all of his trial convictions.