There are two different kinds of possible counter-examples which would incrementally weaken my two-pronged contention that a) Protesters threatening Obama are almost always detained or questioned by the police or Secret Service (or at least are widely publicized by the media), and b) Protesters threatening Bush almost always got off scot-free, with no investigation and no media outrage. The first type of counter-example would need to show protesters whose threats to Obama were ignored; and the second type of counter-example would need to show protesters who actually were arrested for threatening Bush.
The most commonly used AAS in medicine are testosterone and its various esters (but most commonly testosterone undecanoate , testosterone enanthate , testosterone cypionate , and testosterone propionate ),  nandrolone esters (most commonly nandrolone decanoate and nandrolone phenylpropionate ), stanozolol , and metandienone (methandrostenolone).  Others also available and used commonly but to a lesser extent include methyltestosterone , oxandrolone , mesterolone , and oxymetholone , as well as drostanolone propionate , metenolone (methylandrostenolone), and fluoxymesterone .  Dihydrotestosterone (DHT; androstanolone, stanolone) and its esters are also notable, although they are not widely used in medicine.  Boldenone undecylenate and trenbolone acetate are used in veterinary medicine .