Which of the following is an exigent circumstance?

• A. Evanescent evidence
• B. Hot pursuit into a residence
• C. Emergency aid
• D. All of the above

Answer: (C)

Exigent circumstances let police act without a warrant when there is an immediate danger or a risk that events will unfold so quickly that waiting for a warrant would be unreasonable. Emergency aid fits this rule perfectly because it covers situations where officers must enter or take action to protect life or prevent serious harm right now.

Emergency aid is the clearest example of an exigent circumstance—it directly hinges on imminent risk to safety and justifies warrantless action. The other scenarios—evanescent evidence and hot pursuit into a residence—are also recognized as exigent circumstances in many contexts, but when asked for a straightforward illustration, emergency aid is the most direct and universally understood.