The Fourth Amendment to the United States Constitution provides one of the most important protections for individuals suspected of a crime: the right to be free from unreasonable searches and seizures.

The Fourth Amendment states:

“The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.”

This constitutional safeguard prevents law enforcement from arbitrarily invading a person's privacy or seizing property without proper legal justification. In most situations, police must obtain a search warrant supported by probable cause before conducting a search.

However, despite these protections, violations of Fourth Amendment rights occur regularly during criminal investigations.

Your best chance for a positive outcome is to work with an experienced California criminal defense attorney at Eisner Gorin LLP. To set up a consultation, feel free to call us at (818) 781-1570 or reach out to us here.

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What Is a Fourth Amendment Violation?

A Fourth Amendment violation occurs when law enforcement conducts a search or seizure that is considered unreasonable under the law.

This may happen when officers:

• conduct a search without a warrant

• arrest someone without probable cause

• exceed the limits of a search warrant

• seize property illegally

• conduct surveillance without judicial authorization

If a violation occurs, evidence obtained during the illegal search may be excluded from court under the exclusionary rule.

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Common Examples of Fourth Amendment Violations

Warrantless Searches Without Consent or Probable Cause

One of the most common Fourth Amendment violations occurs when police search a home, vehicle, or personal belongings without a warrant, consent, or a valid legal exception.

Examples include:

• officers searching a house without a warrant

• searching a car during a routine traffic stop without probable cause

• entering private property without legal justification

Unless a recognized exception applies (such as exigent circumstances), these searches may violate constitutional protections.

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Using Invalid or Overly Broad Search Warrants

Even when officers obtain a search warrant, the warrant must meet strict legal standards.

Violations may occur when:

• the warrant is based on false or misleading information

• the warrant lacks sufficient probable cause

• the warrant allows officers to search areas unrelated to the investigation

Search warrants must clearly describe where officers can search and what they are allowed to seize.

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Exceeding the Scope of a Search Warrant

Law enforcement officers must follow the limitations listed in the search warrant.

For example, if a warrant authorizes a search for stolen electronics, officers generally cannot search unrelated items such as:

• private financial records

• personal diaries

• unrelated computer files

If officers search areas or seize items outside the warrant's scope, the search may become unconstitutional.

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Illegal Seizure of Property

A seizure occurs when law enforcement takes control of a person's property.

Fourth Amendment violations can occur when officers:

• confiscate property without a warrant

• seize items without probable cause

• take property unrelated to the investigation

Unlawful seizures may lead to suppression of evidence.

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Unlawful Surveillance

Modern investigations often involve surveillance technologies such as:

• GPS tracking

• wiretapping

• monitoring phone records

• accessing electronic data

Many forms of digital surveillance require a court order or warrant. Conducting surveillance without proper authorization may violate the Fourth Amendment.

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Pretextual Stops and Searches

A pretextual stop occurs when officers use a minor traffic violation as a pretext to investigate unrelated criminal activity without proper legal grounds.

For example, an officer may claim a driver failed to signal, even though the officer intended to search the vehicle for unrelated reasons.

If the stop or search lacks legal justification, the resulting evidence may be challenged.

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Illegal Arrests Without Probable Cause

The Fourth Amendment also protects individuals from being arrested without probable cause.

Probable cause means that law enforcement must have reasonable grounds to believe a crime was committed and that the suspect committed it.

If an arrest occurs without probable cause, any evidence obtained afterward may be suppressed.

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Coerced Consent Searches

Police may ask individuals for permission to search their property.

If a person voluntarily consents, officers may conduct the search without a warrant. However, consent must be freely and voluntarily given.

Consent may be invalid if officers use:

• intimidation

• threats

• deception

• coercive tactics

If consent was not voluntary, the search may violate the Fourth Amendment.

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How Defense Attorneys Use Fourth Amendment Violations

When a defendant's Fourth Amendment rights have been violated, defense attorneys can challenge the evidence obtained during the illegal search.

Motion to Suppress Evidence

Attorneys often file a motion to suppress, asking the court to exclude evidence obtained through unconstitutional searches or seizures.

Under the exclusionary rule, illegally obtained evidence cannot be used in court.

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Challenging the Validity of a Search Warrant

Defense attorneys may argue that a warrant was invalid because:

• it lacked probable cause

• it contained false statements

• it was overly broad

If successful, the evidence may be suppressed.

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Motion to Dismiss Charges

In some cases, once illegally obtained evidence is excluded, the prosecution may lack sufficient evidence to proceed.

This may lead to dismissal of criminal charges.

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Related Crimes Often Involving Fourth Amendment Challenges

Fourth Amendment violations frequently arise in certain types of criminal cases.

Drug Possession – Health and Safety Code 11350 HS

Drug possession cases often involve vehicle searches or home searches. If officers conducted the search without a warrant or probable cause, the evidence may be suppressed.

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Drug Sales – Health and Safety Code 11351 HS

Drug sales investigations frequently involve surveillance and search warrants. If investigators obtained evidence through illegal searches, the charges may be challenged.

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Weapons Possession – Penal Code 29800 PC

Firearms possession cases sometimes arise from traffic stops or home searches. If officers violated search-and-seizure laws, the evidence may be excluded.

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Possession of Stolen Property – Penal Code 496 PC

Evidence in stolen property cases may be suppressed if officers unlawfully searched a vehicle or residence.

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Frequently Asked Questions

What is the Fourth Amendment?

The Fourth Amendment protects individuals from unreasonable searches and seizures by the government and requires warrants to be supported by probable cause.

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Can police search your car without a warrant?

In some circumstances, yes. Police may search a vehicle without a warrant if they have probable cause to believe it contains evidence of a crime.

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What happens if police violate the Fourth Amendment?

If law enforcement violates the Fourth Amendment, evidence obtained during the illegal search may be excluded from court.

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What is the exclusionary rule?

The exclusionary rule prevents prosecutors from using evidence obtained through unconstitutional searches or seizures.

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Can criminal charges be dismissed because of an illegal search?

Yes. If critical evidence is suppressed due to a Fourth Amendment violation, the prosecution may lack sufficient evidence to proceed, and the charges may be dismissed.

Eisner Gorin LLP is available to assist you. Book your consultation by calling (818) 781-1570 or filling out our contact form. We are located in Los Angeles.