Both used the same excuse, which was, essentially, "I took some supplement that I didn't know had that in it."
Assuming they're both telling the truth, that's still pathetic. As I wrote at the time of Lewis' suspension:
Memo to all athletes: If you go down to the place where all the muscle heads buy supplements, and you buy anything, and you take it, you're putting yourself in a high-risk category to fail one of these tests. At some point, not knowing is not good enough. Therefore, if it's important to you not to take performance-enhancing drugs, either don't take those supplements, or do some serious research first, and stand by your decisions.
Some mistakes are just mistakes. Things everybody does. Oops, I spilled some soup on my shirt.
Other mistakes only come about from making bad decisions. It's 2011. Professional athletes are getting tested for everything under the sun. Part of being a professional, in this day and age, is knowing what's going into your body. The theory that everything at GNC will pass a drug test has been disproved too many times to count.
There's another mistake here: By my count Matt Geiger, Don McLean, Soumaila Samake, Lindsey Hunter, Darius Miles, Lewis and now Mayo have been caught violating the NBA's performance enhancing drugs program. Players are bigger, stronger and faster than ever. Many of the world's finest enhancers are impossible to test for.
Is it really smart to stick with the theory that performance enhancing drugs are just not a problem in the NBA?