Final answer:
When finding an unconscious person, first check their breathing and pulse. If needed, proceed with CPR after calling 911 and consider using an AED.
Explanation:
The first thing you should do if you find an unconscious person lying on the street is to check the breathing and pulse. This initial assessment will help determine if the person is receiving oxygen and has a heartbeat. If the person is not breathing or doesn't have a pulse, then performing CPR may be necessary after calling 911 for professional help. Additionally, it's crucial to ask someone to get an AED if available, as these devices can help in case of a cardiac arrest.
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