Diagnosis is based on several factors which constitute the circumstances of the incident and observations of place where poisoning happened, in addition to symptoms and results of tests.
It is only when people who shared the same food and drink show similar acute signs and symptoms of poisoning that poisoning is highly suspected. Finding some toxic chemicals or medicinal substances in the room (notice a weird smell or liquid), empty bottles used for keeping such substances, a drug bottle near the victim (or pills scattered nearby).
Providing express first aid to the victim is meant to mitigate the toxic substance as fast as possible, while seeking medical assistance, maintaining breathing, blood circulation and other vital signs.
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