'86 [to] 98 percent likelihood . . . not guilty'

Drew Peterson says he hasn't read the new book about him yet. He's waiting for free copies he's been promised. But he thinks other people should read it.

In Drew Peterson Exposed, author Derek Armstrong relies heavily on lie-detector tests and concludes Peterson probably wasn't involved in the disappearance of his fourth wife, Stacy Peterson.

The tests also indicated Drew Peterson didn't play a role in the 2004 drowning death of his third wife, Kathleen Savio, Armstrong argues.

In an interview, Peterson said those results prove what he's been saying since Stacy Peterson vanished last Oct. 2.

"I've been telling the truth all along," Peterson said. "Why would I take [the tests] if I was gonna lie?"

Peterson cooperated with Armstrong to provide what he called an "objective" account of Savio's death and Stacy's disappearance.

"I said, 'Let's get this story out there from an objective point of view,' " said Peterson, who said he has no financial stake in the book.

Citing the polygraph tests, Armstrong concluded: "There is between an 86 percent and 98 percent likelihood Drew Peterson is not guilty."

Still, Armstrong wrote, Peterson provided seemingly "deceptive" answers to three questions, including one in which he denied knowing where Stacy is.

Peterson said he answered all the questions truthfully -- and is surprised several answers were deemed questionable.

"I can't even speculate on it. I don't know why," Peterson said. "I have my suspicions where Stacy is. Maybe that has something to do with it," he said.

The new book doesn't sit well with relatives of Savio or Stacy Peterson, who note the polygraph tests aren't admissible in court.

"It's meaningless," said Pam Bosco, a spokeswoman for Stacy Peterson's family. "We're not changing our view of what his involvement was with Stacy and Kathleen."

Armstrong apparently views the 54-year-old Peterson differently, at one point calling him "a good father, a moral enigma, but not a killer."

To which Peterson said: "Thank you, I'll take that description."