Action News has learned investigators are looking at special technology to collect evidence.
Perla Vasquez is the driver who was charged with murder.
A search of court records shows she has two prior DUI convictions.
The California Highway Patrol is just about done with its accident investigation, but court documents are already giving us access to their methods.
A search warrant shows us the results of blood alcohol tests on Vasquez, as well as the tool her car is providing investigators.
Officers say this video says a thousand words about Perla Vasquez.
The 24-year-old fell asleep in a patrol car shortly after she was arrested for the crash that killed Frank Winslow four months ago.
In court documents, an officer says Vasquez admitted to having two beers and driving with a license suspended for previous DUIs.
But she also told the officer she felt sober, was driving 65 miles per hour, and only hit Winslow's jeep because he was completely stopped on Highway 168.
Witnesses disagree. They told investigators Vasquez was driving about 80 miles an hour when she rear-ended Winslow's Jeep, forcing it off the road.
Vasquez's Infiniti G35 is now in police custody at a tow yard, and technology inside it could shine a light on the truth of the crash.
The car was equipped with an event data recorder -- a sort of black box that records data -- like the speed right before a crash, whether the driver hit the brakes before or after the air bags deployed, and whether the steering wheel was moved one way or the other.
"I think that will answer any questions in regards to that accident," said Ricky Altero, the owner of Herndon Auto Service, which services several cars that have similar event data recorders. "You bring that up and it shows exactly what happens."
Court documents also reveal investigators tested Vasquez's blood alcohol content twice after the crash.
The warrant says less than an hour afterwards, she registered a .179 - more than twice the legal limit.
A blood sample taken two hours after that showed a BAC still at .13.
The car was registered in her mother's name, but Rosario Vasquez didn't want to comment when action news approached her about the case.
Vasquez is facing murder charges since she has prior DUI convictions, and Victoria Tolson-Flores, a representative from Mothers Against Drunk Driving, attends every one of her hearings.
"Perla Vasquez selfishly endangered everyone in our community and on our roads by choosing to drink and drive," Tolson-Flores said.
Frank Winslow's widow didn't want to do an on-camera interview for this story, but Action News did talk to her Monday.
She told us she misses her husband every day and she also attends every court hearing, hoping to make sure Vasquez pays for her alleged crime.
