What common requirement is shared by Hot Pursuit, Emergency Search, Now or Never, Readily Mobile Conveyance, Arrest in Public, and Plain View Seizure?

What common requirement is shared by Hot Pursuit, Emergency Search, Now or Never, Readily Mobile Conveyance, Arrest in Public, and Plain View Seizure?

• A. Warrant
• B. Written notice
• C. Reasonable suspicion
• D. Probable cause

Answer: (D)

These are well-known exceptions to the warrant requirement, where police can act without a warrant because time, mobility, or safety concerns justify expedient action. The throughline for these exceptions is that they’re grounded in probable cause or a strong basis to believe evidence or a suspect is present, which is what makes the warrantless action legally permissible. In hot pursuit and in emergencies, the urgency created by the pursuit or the immediate need to prevent harm or the destruction of evidence means officers must move quickly. That urgency rests on having a reasonable basis—probable cause—to believe a crime is involved or that evidence will be lost if they wait. For the readily mobile conveyance, the vehicle exception, the ability to search without a warrant hinges on probable cause to believe contraband or evidence is inside, combined with the vehicle’s inherent mobility that makes obtaining a warrant impractical. When arresting someone in public, a lawful arrest typically rests on probable cause that the person committed a crime. The search incident to that arrest is allowed to protect the officer and preserve evidence, without a separate warrant, because the arrest itself was justified by probable cause. Plain view seizures require the officer to be lawfully present and to recognize immediately, based on probable cause, that what they see is evidence or contraband. The seizure follows from that immediate recognition. So, the shared requirement tying these scenarios together is probable cause.

These are well-known exceptions to the warrant requirement, where police can act without a warrant because time, mobility, or safety concerns justify expedient action. The throughline for these exceptions is that they’re grounded in probable cause or a strong basis to believe evidence or a suspect is present, which is what makes the warrantless action legally permissible.

In hot pursuit and in emergencies, the urgency created by the pursuit or the immediate need to prevent harm or the destruction of evidence means officers must move quickly. That urgency rests on having a reasonable basis—probable cause—to believe a crime is involved or that evidence will be lost if they wait.

For the readily mobile conveyance, the vehicle exception, the ability to search without a warrant hinges on probable cause to believe contraband or evidence is inside, combined with the vehicle’s inherent mobility that makes obtaining a warrant impractical.

When arresting someone in public, a lawful arrest typically rests on probable cause that the person committed a crime. The search incident to that arrest is allowed to protect the officer and preserve evidence, without a separate warrant, because the arrest itself was justified by probable cause.

Plain view seizures require the officer to be lawfully present and to recognize immediately, based on probable cause, that what they see is evidence or contraband. The seizure follows from that immediate recognition.

So, the shared requirement tying these scenarios together is probable cause.