There was even talk here as the Games progressed that more Americans would be implicated. The last time around, at Atlanta '96, Irish swimmer Michelle Smith came from nowhere to win gold. People noted that she was once ranked 90th in the 400 individual medley, but since meeting and marrying Dutch discus thrower Erik de Bruijn, her times and her ranking improved. Erik de Bruijn was serving a suspension for the use of two banned substances, including testosterone. Who decides what is unethical.
Sport is by definition dishonest.
Some people are naturally gifted. Others have to work hard. Some people are not going to make it without extra help. To many in the American media, Smith was guilty by association, especially when American Janet Evans all but accused her. It's going to be interesting in the next few days how we will treat Marion in her quest for five gold medals.