Arrest warrant Not required for arrest in public place. Search warrant required to enter third party's home to make arrest. Exigent circumstances urgency, making resort to warrant risky or impractical. Police may search vehicle stopped on open road when there is p.c. to believe it contains evidence. Right applies even when the vehicle has been secured.
Search extends to any area to which p.c.
No threats, pressure, intimidation, or harassment. May be given by suspect or by person sharing common authority and control over area. Apparent authority is enough. Plain view Original intrusion must be lawful. Police activities must be confined to authorized scope.