All you have to do is walk around and talk to people. Interestingly, an article by Richard McGregor and Nicole Jeffery appeared in The Australian in late November to back up his claims. They can't stop the coaches. It appears that competition between the provinces in China is so intense that athletes consider a medal at the National Games to be of greater value than an Olympic medal. The financial rewards are also in keeping with that mentality.
Coaches hire the medical help necessary to take care of their athletes.
The medical community makes additional money this way. There is an entire medical sub-industry as a result of this support. Coaches receive money from city and provincial governments based on performance of their athletes at the National Games. The amounts of money that coaches and athletes earn in this way equal decades' worth of a normal monthly Chinese salary. There is no reason not to cheat.