Jennifer Hart was drunk when she drove the SUV carrying her wife, Sarah Hart, and their children off a cliff near Westport, according to officials from the California Highway Patrol and the Mendocino County Sheriff's Office.
Authorities searching for a family whose SUV plunged into a Northern California river have found the body of a child.
Toxicology tests also found that her wife, Sarah - and two of their adopted children had "a significant amount" of an ingredient commonly found in the allergy drug benadryl.
Mendocino County Sheriff Thomas Allman says the body was found Friday morning about 7 miles (11 kilometers) south of where the family's SUV fell into the rain-swollen Eel River last week.
A body of a Black female was found in the ocean and not far from the crash site, which authorities believe is Hannah or Sierra, but are awaiting the results of an autopsy.
Just days before the crash, the mothers had been reported to the state over allegations of abuse or neglect, according to a spokeswoman for the Washington State Department of Social and Health Services.
Police had previously said they believed the Hart family died in a suicide plunge from a scenic overlook.
Ex-Arkansas officer charged in fight at hotel
WPD is asking for the public's assistance to locate this missing female from the Portage Street area. Velez resigned from the position in December of that year and joined the Cleveland police force.
The remains of Jennifer and Sarah Margaret Hart, both 38, and three of the children were found in the wreckage of a GMC Yukon after it ran off California Highway 1 and plunged over a steep embankment onto the rocky shoreline below.
Carpenter said none of the car's occupants were wearing seatbelts.
The family lived in Woodland, Washington, near Portland, Oregon, and were reportedly on a road trip, though Child Protective Services had been trying to reach them for days.
The 100-foot drop killed the women, both 39, and their children Markis Hart, 19; Jeremiah Hart, 14; and Abigail Hart, 14.
Devonte drew national attention after he was photographed in tears while hugging a white police officer during a 2014 protest.
Two of the Hart children whose bodies have been recovered also had diphenhydramine in their system.
Captain Carpenter in an email on Friday said the authorities were still looking at the crash as "a deliberate act", adding that the presence of alcohol would be a consideration in the investigation's final findings.