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You challenge a case by taking it to trial. You have a Consitutional right to challenge the evidence and confront all the witnesses against you. At your trial, the state will put the undercover officer on the stand so that he can testify to having made a controlled buy and then having described you to his backup team so that they could make an arrest.
After the DA is done eliciting all of that testimony, your lawyer would be able to cross-examine him and challenge his testimony. A jury will ultimately be the ones to determine how credible the undercover's testimony was and how much weight they should give it when making the determination of your guilt or innocense.