Genetic enhancements may be on horizon for athletes(2002, Feb 20) CNN, by R. Blakely [link]
Johnny Huard at University of Pittsburgh notes the likely applications of his research to sport. Renowned for research using growth factor, Huard is supported by quotes from his colleague Freddie Fu and USADA's Larry Bower. Detection is recognised as being difficult again, though specifically because it would involve a muscle biopsy in most cases.
Interestingly, the importance of medical approval is also noted, suggesting that the threshold of what is ethical is solely dependent upon what is medically acceptable.