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A 2-year old is brought in on New Year’s Eve for altered mental status. The parents had been hosting a party with many guests present. The child is maintaining his airway and spontaneously breathing but hypoventilatory and requires occasional stimulation. Vital signs: Temp 37.6 C, HR 90, RR 14, BP 82/40, pulse ox 95% on room air. Other than stupor, physical exam is normal: PERRL, no signs of trauma, not diaphoretic. POC glucose is 58, and the child is given IV dextrose. 

Which of the following substances did the child likely get into?