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Not positive for anything... I'm thinking that the guys who claimed C4 caused their positive were probably taking something else...

No not yet. I think it takes like a month to come back so I'll update when I find out. Apparently numerous others in the unit also said they were taking C4 so I wont be the only one.

Military here... took 2 scoops in the morning a week ago and had urinalysis 5 hours later. We'll see how it turns out. Bought the C4 on base at GNC 8 days ago and they had this sign posted stating it...