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For this question I will defer to the IOC (International Olympic Committee) which is also happens to be the same procedure for NCAA athletes:
Main applicable detection techniques are based on immunoanalysis which may involve a relative lack of antibody specificity and therefore extensive cross reactivities with other compounds. In some cases there do not exist suitable internationally acceptable reference materials in order to fully homogenise results obtained by different techniques in different laboratories. As a consequence, quantitative concentrations found in a given laboratory are difficult to compare with those found in other settings. It is always difficult to establish clear criteria to distinguish an exogenous administration (banned) from a normal endogenous concentration (Segura J., 1991). Ideally, the structure of the peptide detected should be confirmed by mass spectrometry. This is difficult nowadays although new ionisation techniques, new interfaces with chromatographic or electrophoretic systems and evolution of ion analysers will make a contribution to this end in the future.
So to sum it up, they still have no reliable testing procedures in place. Because clearance times can be as little as minutes on some peptides, chances are they will not have a reliable test for years to come