The second theory is similar and is known as "evolutionary neuroandrogenic (ENA) theory of male aggression".   Testosterone and other androgens have evolved to masculinize a brain in order to be competitive even to the point of risking harm to the person and others. By doing so, individuals with masculinized brains as a result of pre-natal and adult life testosterone and androgens enhance their resource acquiring abilities in order to survive, attract and copulate with mates as much as possible.  The masculinization of the brain is not just mediated by testosterone levels at the adult stage, but also testosterone exposure in the womb as a fetus. Higher pre-natal testosterone indicated by a low digit ratio as well as adult testosterone levels increased risk of fouls or aggression among male players in a soccer game.  Studies have also found higher pre-natal testosterone or lower digit ratio to be correlated with higher aggression in males.     
Heavy consumption of the essential amino acid lysine (as indicated in the treatment of cold sores) has allegedly shown false positives in some and was cited by American shotputter C. J. Hunter as the reason for his positive test, though in 2004 he admitted to a federal grand jury that he had injected nandrolone.  A possible cause of incorrect urine test results is the presence of metabolites from other AAS, though modern urinalysis can usually determine the exact AAS used by analyzing the ratio of the two remaining nandrolone metabolites. As a result of the numerous overturned verdicts, the testing procedure was reviewed by UK Sport . On October 5, 2007, three-time Olympic gold medalist for track and field Marion Jones admitted to use of the drug, and was sentenced to six months in jail for lying to a federal grand jury in 2000. 
250 mgs. / 1 cc. vials or preloads. Sustanon 250 is one of the most popular steroids and for good reason. It is precisely set up to give you results for up to a month after injection because each of the testosterones that make up Sustanon 250 stay active in the body for differing time periods. It gives you almost instant results that you can feel since it will hit you about 3 hours after your first injection. The reason for this is the fast acting properties of the testosterone propionate that is in it. The testosterone phenylpropionate and testosterone isocaproate will typically stay active for about 2-3 weeks each and the testosterone decanoate stays active in the body for up to a month. This combination is what gives Sustanon 250 its quick onset which continues to hit you for about 4 weeks after the last injection. This drug also degrades and tapers nicely for the same reasons. Some people will argue that Sustanon is good because since it is made up of multiple types of testosterone, that it "will hit multiple androgen receptors." This could not be further from the truth. You only have one type of androgen receptor. All steroids hit the same androgen receptor regardless of what you are taking.