After some looking I found this article, it has a statement from the inquest at the time of Savio's death, only 2 times in the duration of the Peterson case have I heard anything about DP's alibi, it really got me thinking
From the article:
http://www.chicagosuburbannews.com/batavia/homepage/x187558353
During testimony at a Will County Coroners inquest following Savios death, Illinois State Police Special Agent Herbert B. Hardy said Drew Peterson was with his children that weekend and his whereabouts were totally accounted for that whole weekend, according to a transcript of the inquest.
from Ric Mims:
http://www.amw.com/missing_persons/brief.cfm?id=50297
And in another twist in the case: Drew Peterson's friend Ric Mims tells AMW correspondent Jon Leiberman that when Drew Peterson's third wife, Kathleen Savio, was found dead in a bathtub in 2004, Drew told cops he had an alibi: his fourth wife. Ric says, "He mentioned to me that he was with the kids and Stacy was his alibi. I told him 'it sucks to be you now, because Stacy is gone and they are re-opening the case.'"
I just can't buy it, that he never left his wife and children all weekend, being that he was on patrol when he actually went to her house and found her. I just don't think that there were enough questions about Kathleen's manner of death.
I posted this over at Katleens page but as it pertains to Stacy being who he now says would have been his alibi, I'll leave it here too. It's funny the only thing on the inquest transcript says he was with his children , no mention of Stacy, makes me wonder if there was a reason. Only speculating but some separation/divorce agreements stipulate that during visitation the children can not be in the house with another woman/man that the ex-spouse is not married to. I could think of no other reason that it would not just come out and list Stacy back then also.