A warrant is supposed to be the careful path: before searching, the police lay out their evidence in a sworn affidavit, and a neutral judge decides whether it adds up to probable cause. When that process works, it protects everyone. When it is done carelessly, a warrant can paper over a search that never should have happened, which is why a warrant is the start of the analysis, not the end of it.
This section breaks down what a valid warrant requires and the ways a warrant can be attacked, from the affidavit to the particularity of the description to the freshness of the information to outright falsehoods. I began as an Assistant Public Defender in Florida’s Thirteenth Judicial Circuit, in Tampa, where trying cases and litigating motions to suppress was daily work, and Fourth Amendment issues have stayed at the center of my criminal defense practice.
What a Valid Warrant Requires
The Fourth Amendment, applied to Florida through Article I, Section 12 of the Florida Constitution, sets the requirements for a warrant. It has to be issued by a neutral and detached magistrate, supported by probable cause, based on an oath or affirmation, and particular in describing the place to be searched and the things to be seized. Each requirement is a separate test, and a failure in any one of them gives a basis to challenge the search that followed. In Florida, Article I, Section 12 requires a sworn affidavit, and Chapter 933 of the Florida Statutes, including Sections 933.06 through 933.09, governs how warrants issue and are executed.
A warrant is judged against each of these requirements. When one of them is missing, the warrant is vulnerable, and the evidence taken under it can be challenged.
The Ways a Warrant Can Be Attacked
Each requirement maps to a way of challenging the warrant, and the pages below take them in turn.
The Affidavit Is Where It Starts
Almost every warrant challenge comes back to the affidavit, because that sworn statement is what the magistrate relied on. In Florida, the warrant is generally judged on the four corners of that document, so the question is whether the facts the officer swore to add up to probable cause, describe the target with enough particularity, and rest on timely information. When the affidavit falls short, or when it contains a falsehood that was needed to reach probable cause, the warrant it produced can be set aside and the evidence suppressed.
Many people assume that once the police had a warrant, the search cannot be questioned. That is not how it works. The affidavit can fail to establish probable cause, the description can be too broad, the information can be stale, or the affidavit can contain falsehoods. My job is to read the warrant and the affidavit the way the magistrate should have, and to find the places where it does not hold up. I started out as an Assistant Public Defender in Florida’s Thirteenth Judicial Circuit, in Tampa, and today I am one of six ACS-CHAL Forensic Lawyer-Scientists in Florida. I work both the science and the procedure in your case the way the State’s own analysts and officers are trained to, and I show a jury the exact point where the evidence does not hold up. Learn more about my background.
Questions About Warrants
What makes a search warrant valid?
A valid warrant has to be issued by a neutral magistrate, supported by probable cause set out in a sworn affidavit, and it has to describe with particularity the place to be searched and the things to be seized. A defect in any of these can be a basis to suppress what the search produced.
Does a warrant mean the search cannot be challenged?
No. A warrant shifts the ground of the fight, but it does not end it. You can challenge whether the affidavit established probable cause, whether the warrant was particular enough, whether the information was stale, and whether the affidavit contained falsehoods.
What is the four corners rule?
In Florida, the validity of a warrant is generally judged on the information within the four corners of the affidavit presented to the magistrate. What the officer knew but did not include usually cannot be used to save a warrant that was thin on its face.
Can a warrant be challenged for lies in the affidavit?
Yes. Under Franks v. Delaware, 438 U.S. 154 (1978), if you make a substantial preliminary showing that the affidavit contained a deliberate or reckless falsehood that was material to probable cause, you are entitled to a hearing, and the warrant can fall.
What happens if the warrant was invalid?
If the warrant was invalid and no exception saves the search, the evidence obtained under it can be suppressed. The good-faith exception can complicate that, which is covered in the section on the motion to suppress.
Related pages: Search and seizure overview, the stop, the search, and the motion to suppress.
This page is general information, not legal advice, and it does not create an attorney-client relationship. Search and seizure in Florida is governed by the Fourth Amendment, Article I, Section 12 of the Florida Constitution, and Florida Rule of Criminal Procedure 3.190. The law changes and every case turns on its own facts. Past results do not guarantee a similar outcome.
