The simple fact remains that LA never failed a drugs test, and it is suggested that he is/was the most tested professional sportsman ever, the only evidence the USADA have is statements from proven drug cheats. If the USADA had a positive sample from LA the stripping of his wins and subsequent ban would be accepted by all but there just inst such a sample.
Not to mention those samples are so old, who the hell can guarantee 100% their authenticity or guarantee them 100% tampered free?