A federal law requiring impairment-detection devices inside all new cars survived a recent push to strip its funding but remains stalled by questions about whether the technology is ready. Rana Abbas Taylor lost her sister, brother-in-law, nephew and two nieces when a driver with a blood-alcohol level almost four times the legal limit slammed into their car in January 2019 as the Michigan family drove through Lexington, Kentucky, on the way home from a Florida vacation. The tragedy turned into...