By HOPE YEN and FRANK BASS Beverly Garrett slowed her car in congested traffic during a family trip along Missouri’s Interstate 70, but the 70,000-pound tractor-trailer behind her — its driver slumped over the steering wheel — crashed into her Ford sedan at full speed. The crash killed Garrett, her mother, aunt and niece. A Missouri jury acquitted the driver, George Albright Jr., 63, this month ...