Following a hearing, petitioner, a prison inmate, was found guilty of using a controlled substance in violation of prison disciplinary rules. The misbehavior report, the results of two urinalysis tests and the testimony of the certified ETS operator who performed these tests established that petitioner's urine tested positive for the presence of opiates, thereby providing substantial evidence to support the finding of guilt ( see, Matter of Lopez v. Goord, 242 A.D.2d 816). Petitioner's defense to the charge, i.e., that he had taken the medication Zantac which caused a false-positive result, was refuted by the certified ETS operator who testified that he had ascertained from the manufacturer of the drug-testing equipment that Zantac would not cause a false-positive reading for opiates ( see generally, Matter of Murphy v. Selsky, 239 A.D.2d 724; Matter of Nina v. Coombe, 233 A.D.2d 658). This conflict in testimony presented a credibility issue which the Hearing Officer was free to resolve against petitioner ( see, Matter of Wood v. Selsky, 240 A.D.2d 876, 877). We also reject petitioner's claim that he was denied his conditional right to call witnesses ( see, 7 NYCRR 254.5 [a]), as the record adequately establishes that the testimony of the witness he requested would have been redundant to that supplied by other witnesses ( see, Matter of Greene v. Coombe, 238 A.D.2d 813, lv denied 91 N.Y.2d 801). Petitioner's remaining contentions have been examined and found to be either unpreserved for our review or lacking in merit.
Mercure, J.P., Crew III, White, Peters and Spain, JJ., concur.
Adjudged that the determination is confirmed, without costs, and petition dismissed.