Which of the following is NOT a step first responders should take at the awareness level?

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First responders at the awareness level focus on identifying and reporting hazardous situations rather than conducting full investigations. Their primary responsibility is to ensure safety and facilitate the appropriate response from specialized responders.

Securing the area, notifying authorities, and isolating hazards are essential steps for first responders at this level. These actions help prevent further exposure to danger and allow for the safe management of the scene. However, conducting a full investigation requires training and expertise that goes beyond the awareness level; it typically involves analyzing the situation in detail, which is usually handled by trained professionals, such as hazardous materials teams or law enforcement investigators, in coordination with the respective agencies.

Thus, the option to conduct a full investigation is not aligned with the role and training of first responders at the awareness level, making it the correct answer.