The Florida teenager who beat Noah Lyles in a 100 meter race in April has been suspended for a positive doping test, track and field investigators said Friday. The Athletics Integrity Unit said it issued 18-year-old Issam Asinga with a “notice of allegation” about a positive test for GW1516, a banned substance with a notorious reputation. Asinga is provisionally suspended from competing while the AIU prosecutes the case.