Thymosin beta-4
CJC-1295
Not really performance enhancing, ones a fat stripper (not the one at your birthday party) and the other supposedly helps damaged cells recover.
Although not on the banned list in 2011, not sure how the WADA clause " anything that manipulates natural hormone levels" affects this as CJC-1295 is a hormone.
The only other thing that could come into it is if they have proof that you continued using in 2012, that proof can only be a phone tap as anything else would be speculation.
Denial is your friend.