In May 2015, Iowa State Trooper Tracy Bohlen was patrolling a busy highway when a truck ahead of him stopped suddenly. A teenage boy inside the truck yelled for help. The boy's father, who had been driving a truck, was suffering a heart attack. Trooper Bohlen knew that the man needed help right away. He used the skills he had learned during his training to perform CPR on the sick driver in the middle of the road Dramatic, true stories will keep readers...