In addition, WADA  may include in the monitoring program substances that are on the Prohibited List, but which are to be monitored under certain circumstances—e.g., Out-of-Competition Use of some substances prohibited In-Competition only or the combined Use of multiple substances at low doses (“stacking”)—in order to establish prevalence of Use or to be able to implement adequate decisions in regards to their analysis by laboratories or their status within the Prohibited List.WADA  shall publish the substances that will be monitored.33 Laboratories will report the instances of reported Use or detected presence of these substances to WADA .