Swim star Cate Campbell demands drug testing review after Chinese cheat Sun Yang was cleared of smashing a vial of his blood so it could not be tested Swim star Cate Campbell has called for a review of drug testing protocools Chinese swimmer Sun Yang allegedly smashed a blood vial before it was tested He denies the allegations and FINA cleared claims due to 'insufficient evidence' Campbell is furious over the decision and is demanding answers from FINABy Lauren Ferri For Daily Mail Australia and Aap Published: 13:33 BST, 6 April 2019 | Updated: 13:35 BST, 6 April 2019 Viewcomments Australian swim star Cate Campbell has called for a review of drug testing protocols after Chinese swimmer Sun Yang was cleared of smashing a vial of his blood so it could not be tested. A report by British newspaper The Sunday Times in January claimed Sun, 27, was involved in a confrontation with doping officials at his home in Zhejiang province in September last year. International swimming federation FINA cleared him of any wrongdoing because there was insufficient evidence to sanction him. But World Anti-Doping Agency (WADA) last month announced it was challenging that decision, meaning Sun - a world-record holder and Chinese national hero - could face a lifetime ban if found guilty. Scroll down for video Australian swim star Cate Campbell (pictured) has called for a review of drug testing protocols in the midst of a doping scandal surrounding Chinese swimmer Sun Yang Recent reports claim Sun Yang's (pictured) security guard smashed a vial of his drawn blood with a hammer before it could be analysed, but the swimmer denied the allegations Now, Aussie swimming legend Cate Campbell is demanding a thorough investigation. 'It makes me incredibly angry and it raises some really serious questions that demand answers if WADA and FINA want to remain credible in the world of clean sport, especially where it pertains to Sun Yang,' the swimmer, 26, told https://twitter.com/7NewsSydney/status/1114436752121274368. Multiple Olympic gold medal winner Sun served a three-month doping ban in 2014 after he tested positive for banned stimulant trimetazidine 'We need to rethink how we are tackling doping, because clearly what we're doing isn't good enough. Let's not forget Sun Yang has already tested positive to a banned substance,' Campbell said. After the Sunday Times article, Sun's lawyers issued a statement denying the claims and said the report 'severely damaged Sun Yan's reputation and violated his privacy'. Campbell is furious and is demanding answers from both WADA and FINA 'It makes me incredibly angry and it raises some really serious questions that demand answers,' Campbell said Campbell said Australian swimmers aren't afraid of calling out the dopers and will continue to do so. 'I am 100 per cent certain that all swimmers in Australia are clean, globally there needs to be more attention,' Campbell said. Sun is no stranger to controversy. At the 2015 world titles in Russia, he was accused of assaulting a female Brazilian swimmer after an argument in the warm-up pool. FINA cleared him of any wrongdoing, saying the complaint was a result of 'overcongestion in the warmup pool'. He later failed to show up for the 1,500m freestyle final, citing illness at the last minute. Sun has made plenty of news out of the pool in China, including an incident in which he drove a Porsche without a licence and crashed it into the back of a bus. He was famously called a 'drug cheat' by Australian Olympic swimmer Mack Horton at the 2016 Rio de Janeiro Olympics. The young swimmer was bombarded with half-a-million messages of hate from Sun's fans throughout the games. The abuse began after Horton famously launched a chip at Sun when asked about reports the Chinese swimmer had taunted him in the training pool in Rio. 'It got played up a bit but he splashed me to say ''hi'' and I ignored him. I don't have time or respect for drug cheats,' Olympic debutant Horton said at the time. Sun was famously called a 'drug cheat' by Australian Olympic swimmer Mack Horton at the 2016 Rio de Janeiro Olympics Read more: Share or comment on this article: All rights reserved for this news site dailymail and under his responsibility