Which scorpion is known to be potentially lethal to humans in the U.S.?

The Arizona Bark Scorpion is known to be potentially lethal to humans in the U.S. due to its venom containing neurotoxins that can lead to severe symptoms, particularly in vulnerable populations such as small children, the elderly, and individuals with pre-existing health conditions. While fatalities are rare and most healthy adults can recover with proper medical treatment, the intensity of the pain and possible complications from a sting can be significant, making it the most dangerous scorpion in the region. Its widespread presence in Arizona and other parts of the southwestern U.S. further emphasizes the importance of awareness regarding its potential risks. In contrast, the other scorpion options listed are generally not considered lethal, even if they can deliver a painful sting.