If the manufacturer is producing products in a NSF/GMP facility there should be zero contamination. That would be grounds for termination of certification. I wanted to state that as an Athlete I only take stuff that is manufactured in an NSF/GMP facility...but then I went and looked at a bunch of stuff we use...

Gatorade is not registered with NSF/GMP.

NSF's database is archaic seem searchable. But here's the Informed Choice/Sport list.

Hammer Nutrition is registered with Informed Choice/Sport for three products, but not their gels.
Gu is registered with Informed Choice/Sport.
SiS is registered with Informed Choice/Sport.
Nuun is registered with Informed Choice/Sport.

So we have some giants in the industry avoiding various programs that are meant to show consumers that their products are safe and drug free.

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Washed up footy player turned Triathlete.