Tester in Sun doping case 'was construction worker'

One of the testers in the Sun Yang doping case has said he was not a trained doping-control assistant (DCA) but a construction worker.

Sun is accused of not cooperating with three drug testers at his home on Jan 3, with the three-time Olympic champion declaring his innocence at a Court of Arbitration for Sport (CAS) hearing in Montreux, Switzerland, last Friday.

The World Anti-Doping Agency (WADA) has appealed against an initial ruling by swimming's governing body FINA that cleared Sun of any violation.