1.   Anton and Fiz have never failed a drug test, although none exist to detect EPO in a urine sample.

2.   It is a skepticism deepened by the fact that no tests even exist to detect some of the most potent drugs that athletes are suspected of using.

3.   No known tests exist to detect EPO, which is a drug for patients on kidney dialysis.

4.   Technology exists to detect such airborne threats, but the costs are high, the uses are limited, and experts disagree about its reliability.

5.   The NCAA has since banned colleges from providing creatine even though it is not a banned substance and no test exists to detect excess amounts.