"Sarah Hart and two of the children had a positive toxicology finding in their blood for Diphenhydramine, an active ingredient in Benadryl", it said.
The Harts moved last spring to Woodland, Washington, telling their real-estate broker "they needed a fresh start" after experiencing prejudice in Minnesota and too much media attention in OR after one child was pictured in a viral photo taken at a 2014 police-brutality protest.
Preliminary toxicology tests found Jennifer Hart had an alcohol level of 0.102, said California Patrol Capt. Bruce Carpenter.
Sheriff Tom Allman said in a television interview earlier this month that Jennifer Hart "is the woman that we believe was driving the vehicle when it crashed".
In California, a person is legally drunk if they have a BAC of.08 or higher. Debris at the accident site and other material found along the riverbanks also was consistent with that vehicle, officials have said. The crash happened just days after authorities in Washington state opened an investigation following allegations the children were being neglected.
Authorities have said that data from the vehicle's software suggested the crash was deliberate, though the California Highway Patrol has not concluded why the vehicle went off an ocean overlook on a rugged part of coastline.
Investigators have not come up with a motive but say it appears the incident was intentional, The FBI is deploying their Behavioral Analysis Unit to assist and try to understand what happened. A search for the vehicle was called off when it became too unsafe for rescuers.
The body of a young woman was found nearby about a week ago, but has not yet been identified.
Five bodies were found March 26 but three children remain missing. The women had adopted two sets of siblings - the first (Markis, Abigail and Hannah) in 2006 and the second (Devonte, Jeremiah and Sierra) in 2009.
Devonte drew national attention after he was photographed in tears while hugging a white police officer during a 2014 protest.
Jennifer, her wife Sarah and three of their children were found dead after their auto plunged into the Pacific Ocean March 26.
The Harts moved to a home in Woodland, Washington, in mid-2017, neighbors said.
And authorities have said social services officials in OR contacted the West Linn Police Department about the family in 2013 while they were living in the area.