A search warrant by police of Vasquez's cellphone showed three different streaming services present and showed Vasquez was watching "The Voice" on Hulu at 9:45 p.m.
Last month, the National Transportation Safety Board issued a report that said Uber puts the responsibility for emergency braking on safety drivers like Vasquez. But Uber always requires that self-driving vehicles have backup drivers on hand in case the autonomous system fails.
A photo from the police report show's the self-driving Uber's front-end damage after the fatal crash.
It prompted suspicions that the safety driver was otherwise occupied, and that led police to obtain records from Hulu, Reuters reports.
Uber told HuffPost it considers any smartphone or smartwatch use by its backup drivers while the vehicle is in motion a fireable offense, a point emphasized in training. Vasquez may now face charges of vehicular manslaughter, though it is unclear if county prosecutors have made a final decision.
Vasquez was given a field test and police initially determined she was not impaired.
During Vasquez's ride in the Uber vehicle, which was recorded on video inside the vehicle as part of the testing, she looked down 204 times, mostly in the direction of the lower center console near her right knee, according to the police report. They revealed that she was enjoying NBC's series The Voice on her phone until the time of the fatal accident in March. The company now says it will happen sometime this summer, indicating the top-to-bottom safety review and investigation into the Tempe crash is taking longer than expected. Asked what she was looking at, Herzberg denied she had been using her phone and said she was instead "monitoring the self-driving system interface".
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"We continue to cooperate fully with ongoing investigations while conducting our own internal safety review", the company said in a statement.
The NTSB released its report one day removed from Uber announcing that it would end its self-driving operations in Arizona and lay off around 300 employees connected to the program. Police said that, based on testing, the crash was "deemed entirely avoidable" if Vasquez had been paying attention.
Also released were photographs of Herzberg's damaged bicycle and the vehicle along with police bodycam video that captures the minutes after the crash, including harrowing screams in the background. The NTSB also found that the vehicle didn't alert the driver about the pedestrian, even after sensors detected Herzberg six seconds before impact.
Rafaela Vasquez, who at the time went by Rafael and had not transitioned to female, was streaming The Voice on Hulu when she ran into Elaine Herzberg with the Volvo auto, as she was crossing the street at an unmarked area.
The crash dealt Uber a major setback in its efforts to develop self-driving cars, and the company closed its autonomous vehicle testing programme in Arizona after the incident.
The Maricopa County Attorney's Office referred the case to the Yavapai County Attorney's Office after citing a possible conflict of interest. The vehicle was in autonomous mode at the time of the collision.