What is one possible sign that exigent circumstances may exist during a police response?

The presence of a flushing toilet can indicate exigent circumstances. This is because it suggests that there may be an active situation occurring within a property, such as an individual attempting to destroy evidence or substances that could be relevant to a crime. In many instances, this sound can be a critical indicator that evidence is being compromised or that someone is in the process of fleeing or hiding from law enforcement. Thus, when responding to a situation, police officers may consider this an urgent reason to enter a property without a warrant, prioritizing the preservation of evidence and the safety of individuals involved.

In contrast, the other options do not carry the same implication of immediate action needing to be taken. A loud party noise or a neighbor complaint may suggest disorderly conduct or noise violation but do not inherently present an immediate threat or the potential loss of evidence. A parked vehicle alone does not imply any urgent need to act, as it does not necessarily indicate ongoing criminal activity or the destruction of evidence.