![WADA prohibited List 2014 cover.](https://www.usada.org/wp-content/uploads/Prohibited_list_wide.png)
Potentially Dangerous Class Of Substances Added To The 2014 WADA Prohibited List
In early 2014, anti-doping organizations were made aware that athletes may be using dangerous, highly toxic, and concentrated gases such as Xenon, in an attempt to enhance performance.