Blood alcohol testing of drivers in fatal crashes, however, varies from state to state. Nationwide, the latest statistics show 42.2 percent of all drivers involved in fatal crashes were tested, according to Jim Hedlund, a former NHTSA researcher who now works as a private consultant. Connecticut’s rate was slightly higher at 46.3 percent. Mississippi (23.4 percent) tested least, while South Dakota had the highest rate, with 89.2 percent tested, Hedlund said.