Although police are typically required to obtain a warrant before searching a person, their vehicle, their home, or their office, there are many exceptions in the law to this constitutional requirement. For example, police may search your person once they have placed you under arrest. Police may also be entitled to search your vehicle without a warrant during a traffic stop when they have probable cause to believe that contraband or evidence of a crime will be found in the vehicle. Police can also enter a home without a warrant if they reasonably believe that someone inside is in need of assistance.