A 16yo patient is brought in directly from a large “pharm” party with altered mental status, respiratory depression, and pinpoint pupils. You suspect opiate overdose and administer naloxone with improvement in spontaneous respirations. To your surprise, however, the qualitative urine drug screen comes back negative for opiates. Which of the following drugs is the patient unlikely to have taken?

Negative Utox, what drug is the patient UNLIKELY to have taken?