Cal Robertson, a spokesman for the CHP, confirmed reports that the speedometer was showing 90 miles per hour at the time of the crash, but he said it could have moved during impact or could accidentally have been manipulated during the investigation.
They found that the vehicle had stopped then suddenly accelerated off Highway 101 sending the auto into the ocean 70-feet below reports NBC.
Known as the Hart Tribe, the multiracial family of two married women - Sarah and Jennifer Hart - and six adopted children took spontaneous road trips to camp and hike and traveled to festivals and other events, offering hugs and promoting unity.
Officials still aren't sure when the crash took place.
The parents have come under increased scrutiny, especially after Child Protective Services in Clark County attempted to visit the family on March 23 after their next-door neighbor called police to report signs of child abuse and neglect.
They said the speedometer could have moved at the time of impact during the crash.
"The search for the additional three children belonging to the family continues both at the scene, through water rescue and recovery, and other locations including routes of travel", the California Highway Patrol said in a statement. DeKalb told HLN last Thursday that Devonte and one of his sisters had said they were not being properly treated.
Another neighbor Priscilla Hansen said, "I think it's a awful tragedy to hear and my thought is why adopt six kids and treat them like that".
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A passing motorist discovered the wreck Monday, three days after social service authorities opened an investigation apparently prompted by a neighbor's complaint that the children were being deprived of food. The boy also asked Dana to leave food in a box by the fence for him, she said.
He denied rumors that a suicide note had been found at the Harts' Washington house but said investigators were still evaluating some items found at the residence and said there had been some red flags raised.
The Hart family. From left, Hannah Hart, Abigail Hart, Sierra Hart, Jeremiah Hart, Jennifer Hart, Devonte Hart, Markis Hart and Sarah Hart. The Department of Social and Health Services had no prior history with the family, said Norah West, an agency spokeswoman.
Court records show that in April of 2011, while living in Minnesota, Sarah Hart plead guilty to abusing Abigail Hart and was sentenced to a year of probation for misdemeanor domestic assault.
She said she had done so to discipline the child.
But the family's public appearance may not have matched what was happening in their home.
Family friend Max Ribner stood by the believe that it was nothing more than an accident. It was later learned they had 6 adopted children.
Friends of the Harts had a different view of the couple, describing them to CNN affiliate KOIN as loving parents who gave the kids everything they had and radiated positivity.