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From the 2014 Athlete Guide to the Prohibited List:
http://www.usada.org/wp-content/uploads/2014_Athlete_Guide_to_the_Prohibited_List.pdf
I don't know how far back those athlete guides go or how long ago it was first banned, but clearly DHEA was banned for at least 2 years.
S1. Anabolic Agents
Anabolic Agents are prohibited. This includes the use of prescription testosterone creams (such as Androgel) or injections, or the use of any other anabolic substance (such as DHEA in a dietary supplement). The list of anabolic agents is extensive and even if an anabolic agent is not specifically listed , it is still prohibited if it has
“a similar chemical structure or similar biological effect(s)”.
http://www.usada.org/wp-content/uploads/2014_Athlete_Guide_to_the_Prohibited_List.pdf
I don't know how far back those athlete guides go or how long ago it was first banned, but clearly DHEA was banned for at least 2 years.