Brazil 's Olympic swimming champion Cesar Cielo escapes drugs ban . Special panel of Court of Arbitration of Sport gives Cielo a warning . Cielo can defend his 50 and 100m freestyle titles at Shanghai worlds . The CAS tribunal dismissed an appeal by world swimming 's governing body FINA , who wanted stiffer punishments . Comment:
Brazil 's Olympic swimming champion Cesar Cielo escapes drugs ban . Special panel of Court of Arbitration of Sport gives Cielo a warning . Cielo can defend his 50 and 100m freestyle titles at Shanghai worlds . Comment: