If you think that a person has been poisoned, which of the following is the most important step you can take?

In situations where poisoning is suspected, the most critical step is to initiate emergency assistance by contacting EMS/9-1-1 or the local Poison Control Center. This is essential because professional help is required to assess the situation accurately, provide medical advice, and guide you through the necessary steps to ensure the person's safety. Poisoning can have severe, life-threatening consequences and may require immediate medical intervention that only trained professionals can provide.

While contacting the person's family might seem supportive, it does not address the immediate medical needs. Similarly, giving the person water could potentially complicate their condition, especially if it involves certain types of poison where ingestion of fluids might lead to adverse effects. Checking vital signs is important, but it does not provide the necessary intervention that contacting emergency services or poison control would facilitate. Getting professional help is paramount to ensure the right treatment is administered quickly and effectively.