Not too hard when 17% of all urine samples were masked for EPO. And that's all tests. One wonders about what the percentage would be for cyclists and top cyclists.
No EPO was found in 17 percent of 3,050 athletes' urine samples examined between 2003 and 2006 by the Swiss anti-doping laboratory in Lausanne, said Neil Robinson, who helped compile the study published in this month's edition of medical journal Clinica Chimica Acta.
http://www.bloomberg.com/apps/news?pid=20601109&sid=aDe3l5g45w6E&refer=exclusive
No EPO was found in 17 percent of 3,050 athletes' urine samples examined between 2003 and 2006 by the Swiss anti-doping laboratory in Lausanne, said Neil Robinson, who helped compile the study published in this month's edition of medical journal Clinica Chimica Acta.
http://www.bloomberg.com/apps/news?pid=20601109&sid=aDe3l5g45w6E&refer=exclusive