There are six major exceptions to the warrant requirement.
1. Search Incident to Lawful Arrest
A search incident to lawful arrest does not require issuance of a warrant. In other words, if someone is lawfully arrested, the police may search her person and any area surrounding the person that is within reach (within his or her “wingspan”). See Chimel v. California, 395 U.S. 752 (1969)
EXAMPLE: John is arrested for driving while intoxicated after being pulled over for running a red light. A search of his car reveals 8 bags of heroin in the glove compartment and an illegal handgun in the trunk. The heroin is admissible evidence for which no warrant was required as the glove compartment is certainly within John’s wingspan. The gun found in the trunk, however, was not within his wingspan, and was the result of an unreasonable search. This evidence will be excluded.
2. Plain View Exception
No warrant is required to seize evidence in plain view if the police are legitimately in the location from which the evidence can be viewed.
EXAMPLE: an officer cannot illegally enter a suspect’s back yard and then use the plain view exception to seize an illegally kept alligator living in the pool. But, if on the premises to serve a warrant duly issued to search for marijuana plants, the alligator, if in plain view, can rightly (though by no means easily) be seized.
If consent is given by a person reasonably believed by an officer to have authority to give such consent, no warrant is required for a search or seizure. So, if a suspect’s "significant other" provides police with a key to the suspect’s apartment, and police reasonably believe that she lives there, the search will not violate suspect’s Fourth Amendment rights even if she did not live there and even if she, in fact, lacked authority to consent, . See Illinois v. Rodriguez, 497 U.S. 177 (1990).
EXAMPLE: Officer Warren knocks on a murder suspect’s door. the door is answered by the...
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