"It was pure acceleration from the last brake application until it hit the bottom of the cliff", Greg Baarts, the acting assistant chief of the California Highway Patrol's northern division, said at the time.
The woman had not been formally identified but Allman earlier said the body was believed to have been one of the people in the auto. The bodies of three of their children - Markis, 19, Jeremiah, 14, and Abigail, 14 - were found nearby. The crash was discovered on March 26 along the Mendocino County coastline on Highway 1 near Westport.
A helicopter scours the scene as investigators try and understand what happened to the three missing children. Hannah Hart, the third of the siblings adopted from Colorado County, was still missing Wednesday afternoon, along with Devonte and Sierra Hart, two siblings adopted by the family in Harris County in 2009.
A vehicle owned by the couple-Sarah and Jennifer Hart, both 38 - was found at the bottom of a cliff that overlooks the Pacific Ocean in California's Mendocino County on March 26.
He noted the Yukon had traveled some 23 metres along an unpaved roadside pullout before running off the cliff, leaving behind no skid or brake marks, indicating the vehicle may have been driven off the cliff intentionally.
Bruce Carpenter said Friday that toxicology tests found Jennifer Hart had an alcohol level of.102. But he declined to say precisely how high it was.
Police have said a search of the family's home in Woodland, Washington, turned up no suicide note.
Search teams found debris and personal effects identified as belonging to the Thottapilly family on Thursday.
Devonte Hart gained fame when this picture of him hugging officer Johnny Nguyen at a Portland rally went viral. The vehicle appears to have left a highway for a dirt turnout, then accelerated on that turnout for about 70 feet until it went off the cliff, authorities said, citing data from the vehicle's software and air bag module. Jennifer Hart pulled the girl aside and the child agreed to leave, the report said.
Paul Stephenson, chief executive at Cheltenham Borough Homes, said: "We continue to work closely with the family and their support workers to resolve this ongoing situation".