Mary “Missy” Cummings, an engineering professor at George Mason University, told jurors in Miami federal court that the Tesla owner’s manual, which contains critical warnings about how the system

A critical voice took the stand Wednesday in the first-ever federal jury trial involving Tesla’s Autopilot system: a safety expert who says the technology is defective and promoted in ways that encourage misuse.

What happened the night of the crash: GEORGE BRIAN MCGEE was driving a Tesla in Key Largo on autopilot. He’d been on the phone with an airline’s customer service when he dropped his phone, then reached down to get it.