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These patients are displaying signs of exposure to an acetylcholinesterase inhibitor, such as sarin nerve gas, leading to significantly increased stimulation by accumulated acetylcholine. Symptoms of acetylcholine excess include salivation, lacrimation, urination, diaphoresis, vomiting and diarrhea, bronchospasm, blurred vision due to miosis, arrhythmias, hypotension, and altered mental status. Carfentanil exposure leads to symptoms of confusion, respiratory depression, and apnea consistent with opioid overdose. Sulfur mustard is a blistering vesicant agent that attacks the DNA and RNA and cell membranes leading to rapid binding and irreversible recovery of function. Symptoms of sulfur mustard exposure include airway inflammation, vomiting and diarrhea, and dehydration from fluid loss through affected skin. Hydrogen cyanide is a cyanotic agent that leads to impaired oxygen utilization by end organs and tissues. Symptoms include cherry-red hue to the skin, confusion, giddiness, nausea and vomiting, and loss of consciousness.