The agent responsible for the condition of the boy is Phencyclidine (PCP).
Phencyclidine is also commonly referred to as angel dust. The drug causes mind-altering effects. Some of the effects of the drug include distorted sound perception, hallucinations, hyperactivity, violent behavior etc.
It is a recreational drug and can be taken through the mouth, smoked, or injected into the body system. .
Since the boy appears euphoric, emotionally labile, disoriented and has hypersalivation, then this is the effect of taking Phencyclidine.
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