Nothing at the at the food grade or even pharm grade level is 100% pure. It's just a matter of what the other 0.05-1% 'contaminants' are.
In some crappy chinese facilities that 1% contamination might be from the 100's of kilos of AAS they just had running down the conveyor belt. Which is then testable on the DEA/FDA/BCSG level of equipment but not (many) commercial levels.
If any company has their products tested by the FDA and they come from a ****ty chinese facility it might test 'positive' for 'steroids' it gets publicized out of proportion and before you know it you are indicted for distribution of these compounds through your creatine...
On some levels it's absurd and on others it makes sense.
In reality, the testing methods for Creapure are just more sophisticated than other routes and thus the standards for the purity are much higher.
in = Garbage out