Investigative Detentions Summary

Investigative Detentions

Summary of Investigative Detentions

  • Terry v. Ohio (1968):

    • an officer can stop a person if they have a reasonable suspicion, even without probable cause.

Categories of Police-Citizen Encounters

  • Courts recognize three main categories of interactions:

  1. Mere Encounter - non-coercive, lacks level of suspicion, individuals are free to leave.

  2. Investigative Detention - brief stops that require reasonable suspicion.

  3. Arrest/Custodial Detention - more intrusive, requires probable cause.

Key Concepts from Judicial Precedents

  • Adams v. Williams (1972): A protective frisk is justified if an officer has a reasonable belief that a person is armed and dangerous based on information from a reliable informant.

  • Florida v. Royer (1983): Seizures must be based on reasonable suspicion, and individuals have the right to ignore police inquiries.

  • Illinois v. Wardlow (2000): Unprovoked flight in a high-crime area contributes to reasonable suspicion.

  • United States v. Hensley (1985): Police can stop individuals based on information from another law enforcement agency, but that information must be reliable.

Frisk and Search Guidelines

  • Terry Frisk Standards: Limited to searching for weapons if there is reasonable suspicion the person may be armed. Officers cannot conduct a frisk based on generalizations (e.g., guns follow drugs).

  • Commonwealth v. Hicks (2019): Possession of a concealed firearm alone does not justify an investigatory detention without reasonable suspicion of criminal activity.

Specific Cases Illustrating Principles

  • U.S. v. Sokolow (1989): Reasonable suspicion can be based on several factors, such as behavior, cash transactions, and travel patterns.

  • Commonwealth v. Lewis (1994): Anonymous tips without corroboration do not constitute reasonable suspicion.

  • Commonwealth v. Revive (2005): Transportation of suspects can occur in exigent situations without turning a stop into an arrest.