In any case, small homebrew or big lab, it's in the interest of every supplier to have good gear. Good gear = good reputation and repeat/new business. Rest assured, suppliers do care that their gear is good. If they find out that their powder supplier is bad, they will find a better one. We can't ascertain the entire quality of one guy through just one blood test. More blood tests for MLG will follow anyway. He's had good reviews so far, it's important not to overreact to just one test from one guy.