Final answer:
At an active shooter incident, first responding officers are responsible for locating the entry point into the hot zone unless there's an imminent risk requiring additional resources.
Step-by-step explanation:
At the scene of an active shooter incident, the responsibility to locate the entry point into the hot zone falls primarily on the first responding officers unless there is an imminent risk that cannot be mitigated without additional resources. These entry points are critical for the to gain access to the area where the threat is most active and take necessary action to neutralize the shooter and prevent further harm.
In such high-stake situations, officers must quickly assess the circumstances and decide the best course of action, which may include immediate entry or waiting for backup and specialized units depending on the level of risk and available information.