First, a history of AAS is criteria to exclude you from donating products because in their minds AAS use is associated with other high risk behavior including but not limited to infections with or without sharing needles. You should be honest about it, as I am sure you would be pissed if your family member was exposed to hepatitis or HIV because someone lied about their past as happens sometimes.

To answer your question, they are primarily after your red cells and platelets and 99% of the plasma where the steroids are is separated or washed off of them before they are given to the recipient. The plasma that is recovered which may be used is usually frozen which will probably inactivate much of the hormones anyway; but, steroids have their effects by cumulative dose- that is it takes more than a one time exposure to realize meaningful physiologic impact with rare exception.