Sorry I just can't resist.
It amazes me how people go off without understanding what they are talking about. By the way this is not about Mullings guilt or innocence or whether he should compete or not compete.
First you likely wouldn't "take" testosterone so it wouldn't make any sense for someone to spike your toothpaste with it.
Everyone has testosterone. However levels that are abnormally high or low can indicate the use of drugs that can alter the bodies natural levels and give a performance advantage. While taking an enhancer the levels could be boosted. Similarly they could actually be low after you've stopped because the body reduces the amount that it produces because of excess amount produced by whatever enhancer.
What WADA tests for as far as testosterone goes are unnaturally high or low levels. This is a some what arbitrary mark because everybody produces a different amount at different times in their life. However, WADA chose a level that it felt would be highly unlikely to occur naturally. The key words are highly unlikely. Given the perceived problem of drugs in sports picking a level that was absolute would allow far too many, and probably almost all, cheats to get through. But it is possible to convict an innocent person, although unlikely. WADA's currently getting heat for this because of the Nandrolone(sp) issue.
As for Mullings, the skuttle but is that the level he tested for would have been legal in the NFL but was over WADA's limit. Take that for what it's worth. I think the biggest problem WADA has is it's one size fits all approach to the way it handles positives. For a testosterone positive the best approach is probably to have follow ups and to warehouse an athletes levels. That way you can have a baseline and check for deviations. You can still ban them but wave or suspend it if the baseline levels aren't out of line with the tested levels. And it could be "their" responsibility to pay for the tests in order to clear their names.
For Nandrolone a quick follow up test would do wonders (it stays in the body almost forever, as far as drug life goes). Basically, for a lot of substances, follow ups to validate a result aren't that difficult. I think the desire to clean up the sport is good. But this aggresive lynch mob approach may hurt more than it helps. People just jump and say "Guilty, hang Em" and then proceed to demonstrate that they don't have a clue what they're talking about.
Their is way too much hate and viciousness associated with this subject and it really shows. People who may good intentions come across as jealous, small, and petty. Mainly cause they jump to the sentencing with paying any attention at ALL to the case.