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Probable cause
Trustworthy facts or knowledge sufficient for a reasonable person to believe that the suspect has committed or is planning to commit a crime
What is always required for any valid arrest?
Probable cause
Arrest
Occurs when police take an individual into custody for purposes of criminal prosecution or interrogation
Non-emergency home arrests require
a warrant and reasonable believe that the suspect is at home
What is required for police to execute an arrest of a suspect in a third party’s home?
Search warrant
Detention
A governmental seizure of a person that is less than a full custodial arrest
Common government detentions
Stop and frisk, automobile stop, stationhouse detention, detention to obtain a search warrant, detention of occupants of a premises
To stop or pull over a vehicle,
police must have reasonable suspicion that a law has been violated
Pretextual stops
ulterior motive for a stop is ok if police have probable cause of a traffic violation
Accompanying searches in Automobile stops
Police may search passengers and passenger compartment (but not the trunk) if officer reasonably believes weapons may be present. The entire car may be searched if probable cause arises pursuant to the automobile search exception.
Determining the reasonableness of a search or seizure
1) Is there government conduct constituting a search or seizure?
2) Does D have standing?
3) Is there a valid search warrant?
4) If there is no valid search warrant, was there a valid exception to the search warrant requirement?
Exceptions to the search warrant requirement
Search incident to arrest, Plain view search, Automobile search, Valid consent to search, Exigent circumstances, Stop and frisk
Fourth Amendment only applies to
government conduct (direct or authorized); does not protect against private conduct
authorized conduct
private persons acting at the direction of government agents
Fourth Amendment only applies if
a person has a reasonable expectation of privacy in the thing or place to be searched
Reasonable expectation of privacy exists if D either
a) owns, has a right to possess, or lives in the premises to be serached, or b) is an overnight guest of the premises to be searched
Requirements for a valid warrant
1) Based on probable cause, 2) Precise on its face, 3) Issued by a neutral and detached magistrate
Police affidavit may make warrant invalid if
1) there was a false statement, 2) affiant intentionally or recklessly included a false statement, and 3) false statement was material to finding probable cause
Good faith exception for search warrant
exclusionary rule does not apply if police act in good faith on an invalid search warrant
Police cannot rely on a defective warrant obtained in good faith if
a) affidavit completely lacks probable cause, b) warrant is defective on its face, c) police or government official lied or misled magistrate, or d) magistrate has “wholly abandoned her judicial role”
Automobile Search Exception
If probable cause exists, police may search an entire vehicle (including the trunk) and containers or compartments inside that may contain the evidence they are searching for
Requirements for Automobile Search Exception
1) police must have probable cause to search the vehicle and 2) probable cause must arise before the search begins
Public school searches
To conduct a search, school officials must have reasonable grounds to believe the search is necessary
International Mail search
Officials can open and inspect international mail if they have reasonable suspicion it contains contraband
Immigration searches
Officials may raid a business to determine the citizenship status of its employees
Exclusionary rule does not apply to:
1) Grand jury proceedings, civil proceedings, parole hearings, or administrative cases,
2) Violations of the “knock and announce rule” in executing search warrants,
3) Evidence derived from statements obtained in violation of Miranda
Exclusionary rule
Prohibits the introduction of evidence obtained in violation of D’s constitutional rights in a criminal trial
Co-defendant confessions
a co-defendant’s confession implicating D is inadmissible against D at a joint jury trial (OK at bench trial)
Confession of a Co-Defendant is admissible if either:
a) Confessing co-D testifies subject to cross examination, b) Ds have separate trials, c) confession is redacted so that all portions referring to the co-D are eliminated, or d) co-D’s confession is used to rebut D’s claim that his confession was obtained coercively
6th Amendment Right to Confront Witnesses
D has a right to have adverse witnesses testify in-person and subject to cross examination
Confrontation: In person testimony is not required if
1) exclusion is necessary for public policy, and 2) reliability of the testimony is otherwise assured
5th Amendment Privilege Against Compelled Self-Incrimination
Any person in any proceeding (civil or criminal) may refuse to answer a question if her response might incriminate herself
5th Amendment privilege against compelled self-incrimination is only available for
compelled testimonial or communicative evidence
Double Jeopardy
Arises when D is prosecuted with one crime and tried, then charged again based on the same offense
When jeopardy attaches in jury trial
Attaches once jury is impanelled and sworn in
When jeopardy attaches in bench trial
Attaches once the first witness is sworn in
When jeopardy attaches in pleas
Attaches once court accepts a plea agreement
Once jeopardy has attached, retrial is still allowed if either:
a) Hung jury, b) Mistrial due to manifest necessity, c) Retrial after a successful appeal by D, d) D breaches a plea bargain agreement, e) Separate sovereigns
Lineup
witness is shown several possible suspects
Remedy for exclusionary rule violation - harmless error review
For admission of illegally-seized evidence o be upheld on appeal, government must show that it was harmless beyond a reasonable doubt