Lecture Notes
Arrests are a vital tool that can help law enforcement officers catch the guilty and free the innocent.
But, arrests must satisfy the reasonableness requirement of the Fourth Amendment. Arrests are Fourth
Amendment seizures but are more invasive than stops. Arrests can last longer, result in being taken to
the police station, and are recorded. Arrests can also result in fear, anxiety, and loss of liberty. These are
The probable cause requirement balances the societal interest in crime control and the individual
right of locomotion. Law enforcement officials must have enough facts to believe a crime has been or
is about to be committed and the person arrested has committed, is committing, or is about to commit
the crime. Probable cause is more than the reasonable suspicion needed to affect a stop but less than
proof beyond a reasonable doubt required to convict. Police apply the probable cause requirement on
the streets, having to make quick decisions. Judges have the final say on whether officers had probable
cause to arrest.
Officers can use both direct information and hearsay to build probable cause. Direct information
includes such things as what officers see, hear, and smell as well as fingerprints, DNA evidence,
resisting an officer, and fleeing the scene. Hearsay is gathered from victims, witnesses, other officers,
and informants. Hearsay from an informant can be used to build probable cause if it is corroborated by
an officer’s direct observations.
Arrest warrants are required to enter homes to arrest unless exigent circumstances exist. The most
common exigent circumstances include hot pursuit, need to protect officers, prevent the destruction of
evidence, and prevent the escape of suspects.
In Tennessee v. Garner, the Court ruled that use of deadly force to seize a suspect is subject to the
Fourth Amendment’s reasonableness requirement, which requires probable cause. The Court also ruled that
using deadly force to prevent the escape of a fleeing felon is unreasonable unless the suspect is an
immediate threat to the officer or others. In Graham v. Connor, the Court ruled that the use of non-deadly
force to arrest a suspect is also a Fourth Amendment seizure and during and after arrests, officers can use
only the amount of force that is objectively reasonable to get and maintain control of suspects they have