Photo by AP

SAN DIEGO — Investigators are confronted with a series of nagging questions as they try to unravel the case of a California real estate agent who said his Toyota Prius turned into a runaway death trap after the gas pedal became stuck.

Why didn’t the driver simply throw the transmission into neutral as officers urged him to do? Why didn’t a safety mechanism activate that was supposed to cut power to the engine in such situations? And could he have made the story up in pursuit of fame and money?