Why does a different steroid test have to be developed for each anabol

because each one has a slightly different metabolite... most steroids are slight variations of testosterone and when your body metabolises them, each one creates a slightly diff metabolite.. if you are taking testosterone though, then a blood test must be used.. your body alread has testosterone in it so the precense of testosterone metabolites does not necessarily mean a postitive for steroid use,, test is normally tested for using some type of medically accepted scale that creates limits for the normal amount of test that would be in a normal person of a certain age etc... if you have more test floating around in you then you are suspected of adding into your system