Levandowski has since asserted his fifth amendment rights to avoid self-incrimination, though he also voluntarily stepped down from the division last month. Uber has been unable to convince Levandowski to open up to the investigation, however. "Over the last few months Uber has provided significant evidence to the court to demonstrate that our self-driving technology has been built independently," Angela Padilla, Uber's associate general counsel for employment and litigation, wrote in an email obtained by the Times. "Over that same period, Uber has urged Anthony to fully cooperate in helping the court get to the facts and ultimately helping to prove our case."