The 2019 Chicago Marathon has come and gone. The winners have flown off, heading to their next races. Most bystanders have gone back to work this week, forgetting all about the cool Sunday morning air and the 40,000 runners passing them by.One person who has not forgotten about the race is Travis Tygart, the U.S. Anti-Doping Agency CEO since 2007.The agency was created in 2000 in an effort to combat athlete doping and …