NEW YORK ( CNN ) -- The body of a woman who authorities say was impaired by marijuana and alcohol when she caused a deadly head-on collision shows no signs of long-term alcohol use , according to an investigator hired by her family . Diane Schuler 's minivan was heading the wrong direction as the wreck happened , police said . `` I have looked at the autopsy , and the pancreas , liver and esophagus were clear , '' Tom Ruskin , lead investigator and president of CMP Protective and Investigative Group , told CNN . `` I 've never seen a case like this . No one has seen this woman drunk and we have interviewed over 50 people -- relatives , friends , colleagues and former employees from her company . '' The Westchester County medical examiner 's office found that Diane Schuler , 36 , had a blood alcohol level of .19 percent -- more than twice the legal limit -- and had marijuana in her system when she drove a minivan the wrong way on the Taconic State Parkway and ran head-on into an SUV . Three adults in the SUV were killed in the July 26 crash , along with Schuler and four children in her minivan -- her daughter and three nieces . A fifth child , Schuler 's son , survived and is in stable condition . Ruskin , a former officer in New York Police 's narcotics division , said he is hesitant to fully accept the autopsy report . `` I 'm not saying the autopsy is wrong or right . I do n't know if she smoked pot weeks prior . Marijuana stays in your system for up to 30 days , '' he said . The medical examiner 's office released a statement on August 6 , saying it stands by its autopsy results , and reiterated that Sunday . Schuler 's family expressed shock when the details were revealed , saying she had no history of substance use . `` There 's no way she 'd do this , '' Jay Schuler , Schuler 's sister-in-law , said earlier this month . `` She was responsible . '' Tests revealed that Schuler had an additional six grams of alcohol in her stomach that had yet to be metabolized , according to Maj. William Carey of the New York State Police . A vodka bottle was also found in the vehicle after the crash . Ruskin is adamant that it is necessary to go back through the day of the crash . `` We are analyzing all of the data that we have to date . We have a staff that has consumed themselves with this case , '' he said . `` We are trying to determine what happened here . '' Schuler 's husband , Daniel , `` would like to remind people that no matter what happened here he lost his wife , his daughter , his nieces and he also grieves for the Bastardi and Luongo families , '' Ruskin said , referring to the other crash victims . `` He talks about that constantly in my daily conversations with him . ''
Autopsy shows no signs of heavy alcohol consumption , investigator for driver 's team members . Police says Diane Schuler not known as heavy drinker . Schuler , 7 others killed in head - on collision as she drove wrong way on parkway . Schuler had high levels of alcohol , marijuana in system during driving , officials said .