When Colman Chadam was born in 2000, he underwent extra medical tests after a congenital heart issue was discovered. Doctors learned that the infant carried genetic markers associated with cystic fibrosis, but he never went on to develop the disease.
In fact that test was the boy’s only interaction with it—until 2012, when he was kicked out of middle school. His parents had offered up the information when they enrolled him at a school in Palo Alto, Calif., and somehow teachers found out, reports Wired.