In split-sample situations, bottle B gets tested only if bottle A is confirmed positive for a particular drug(s), and that the donor had decided to mount a challenge to the results of bottle A.

But since synthetic subs contain no drug metabolites to test positive for, you have nothing to worry about.

Forget the herbal 'detox' potions. By doing a Forum Search with the terms "detox products scam dilution", you'll discover that all "detox" products are a scam to prey upon the uninformed and credulous and taking their hard-earned cash.