MADISON, Wis. — Among the hundreds of cases brought by individuals across the United States claiming their Toyota vehicles accelerated without warning, only Bookout v. Toyota Motor, tried in Oklahoma County, Okla., resulted in a verdict against Toyota. This was also one of the first unintended acceleration cases to go to trial since the Japanese carmaker began recalling millions of vehicles in 2009 over this very issue. The Oklahoma case was also the first in which plaintiffs' attorneys put the fault squarely on a flaw in the vehicle's electronic throttle control system. They dismissed arguments about floor mats and sticky...