People often mix this up with probable cause, but they are not the same. Probable cause is a standard officers may need before searching, arresting, or getting a warrant. An unreasonable search and seizure is the broader constitutional violation that happens when the government intrudes on a person's privacy or freedom without adequate legal justification. A search is a government look into a place, item, or data where privacy is reasonably expected. A seizure is a meaningful restraint on a person, vehicle, or property. It becomes unreasonable when it violates the Fourth Amendment or, in Oregon, Article I, section 9 of the Oregon Constitution - often because there was no warrant, no valid exception, or the stop or force went too far.

Practically, the issue often comes up after a traffic stop, a home entry, a phone search, or a detention that lingers longer than the law allows. If evidence came from an unreasonable search or seizure, a court may suppress it. If someone was physically hurt during the incident, the same facts may also support a civil rights claim, a personal injury case, or both.

In Oregon, timing matters. Personal injury claims generally have a 2-year statute of limitations from the date of the accident. When an unlawful seizure leads to injury and treatment - sometimes at OHSU in Portland, the state's only academic medical center and Level I trauma center - medical records, body-camera footage, and witness accounts can become central proof of damages.