Jennifer Hart had an alcohol level of 0.102, according to a news release from the Mendocino County Sheriff's Office, citing a preliminary toxicology report.
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.
The CHP said on Friday nobody in the SUV was wearing a seat belt when the auto when over the cliff.
"Searchers located the deceased body of an adult female approximately seven miles north of the reported crash site (Eel River flows in a northern direction)", California's Mendocino County Sheriff's Office said in a statement. A specialized team of accident investigators is trying to figure that out with help from the FBI, Carpenter said.
The sheriff, who has said he believes the crash was "an intentional act", would not say why he thought the Harts had used the over-the-counter allergy medication. "The legal limit for driving in California is 0.08".
Police also said the Federal Bureau of Investigation was sending its Behavioral Analysis Unit to study cellphone data recovered from one of the family members' phones showing the Hart family's travel information.
This comes after a body, believed to be one of the children, was found near the cliff last week.
Rescuers in the U.S. have found the body of a woman while searching for a missing Indian family of four who are feared drowned in a California river.
Mothers Sarah and Jen, both 38, died, as well as their children Markis, 19, Abigail, 14, and Jeremiah, 14. Their three other adopted children are missing, 16-year-old Hannah Hart, 12-year-old Sierra Hart and 15-year-old Devonte Hart, who is known for a viral photo in which he is hugging a police officer in November 2014.
A neighbor of the Harts in Woodland, Washington, had filed a complaint, saying the children were apparently being deprived of food as punishment.
After Sarah Hart pleaded guilty to a misdemeanor charge of domestic assault, she and Jen pulled their children from schools in Minnesota, in favor of homeschooling.
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. Cheryl Hart shares the same last name but said she's not related to the family. She says the six kids were regularly punished for common childlike and adolescent behavior, such as laughing too loudly.
Argyropoulos says the family's story has spurred her to start a petition calling for a national child abuse registry. "They were able to locate numerous items that appeared to have come from a vehicle body and interior", the Garberville office of the California Highway Patrol said.