if you look at his story on meso, you can see that he shares the results, whether they are good or bad. and he also share the results on his website, so Who buy from him will know before , if the products are underdosed or not. he never sends blind samples, because he is interested in having the brand and the molecule written in the report, so no customer can say that he sent a different sample than the one analyzed. (it's not like me that I'm an end user, so the tests I do do it just for me, because I haven’t to show it to someone who has to buy, so I send only blind samples)
However if simec don’t detected nothing, but the products had been used from his customers, and they were satisfied , it is evident that simec made some mistakes, then if the same sample was analyzed by lab4tox and it detected the molecule declared on the label, this error is even more evident. however there is no need to wonder, mistakes can happen, simec is always a good laboratory, but in my opinion the price (290 euros for a sample aas) does not justify a better quality and reliability of the lab tests.