The Harvey-Madden rule is a California evidentiary requirement that governs arrests and searches based on information one officer receives from another. When police act on a dispatch, a bulletin, or a tip relayed through official channels, the arresting officer does not personally need to know the underlying facts. But if the defense later challenges the arrest, the prosecution must prove that the original source of the information actually existed and had a legitimate factual basis for what was passed along. The point is not to prove the tip was true. It is to prove the tip was real.
What the Prosecution Has to Show
The burden is narrow but firm. Prosecutors must demonstrate “that the information was not falsely manufactured by those reporting it to the arresting officers to furnish ostensible grounds of probable cause for arrest.”1Alameda County District Attorney’s Office. Harvey-Madden The California Supreme Court in People v. Madden put it in terms of probable cause: when an officer acts on information received through official channels, the prosecution must show that “the officer who originally furnished the information had probable cause to believe that the suspect committed a felony.”2Justia. People v. Madden
Put simply, the state has to trace the information back to a real, sworn, or otherwise verifiable source. If it cannot, the arrest fails, no matter how confident the officer on the scene was.
One procedural detail matters here. The prosecution does not have to make this showing spontaneously. The rule kicks in only when the defense specifically invokes it. If the defense fails to raise the issue, it is treated as waived.1Alameda County District Attorney’s Office. Harvey-Madden
How Prosecutors Meet the Burden
Once the defense raises a Harvey-Madden challenge, the prosecution has several ways to trace the chain of information back to a legitimate source:
- Testimony from the original source, such as the witness, victim, or officer who first reported what they observed.
- Testimony from an intermediary, like a dispatcher or the officer who took and passed along the call.
- Certified police communication records that document the original transmission, which can substitute for live dispatcher testimony.
- Circumstantial evidence corroborating the dispatch — for example, the arresting officer testifying that the scene matched what was broadcast.
- The warrant itself, or a certified copy, if the arrest was based on an outstanding warrant.
Any one of these can be enough. What is not enough is the arresting officer simply saying they were told to make the arrest, with no evidence about where the underlying information came from.
Where the Rule Comes From
The rule takes its name from two California cases decided about a decade apart.
In People v. Harvey (1958), officers arrested a man at his home based entirely on instructions from a superior officer who claimed to have received a tip from an informer. By the time of trial, the superior officer had died. No one could testify under oath about the original tip. The Court of Appeal reversed, holding that a subordinate officer cannot justify an arrest based solely on a superior’s unsworn claim about what an informer said. Allowing that, the court warned, would permit arrests through stacked hearsay “without requiring the sworn testimony of anybody that the information upon which the arrest was made was actually given to any police officer.”3FindLaw. People v. Harvey (1958)
Twelve years later, the California Supreme Court in People v. Madden made the principle categorical. Officer Walker had arrested a man for selling narcotics based on information from two fellow officers and a confidential informant, but Walker never explained what facts the other officers relied on. The court reversed the conviction and stated the underlying rule plainly: when justifying an arrest, “the People must prove that the source of the information is something other than the imagination of an officer who does not become a witness.”2Justia. People v. Madden
How People v. Scott Applied the Rule to Search Warrants
People v. Scott (1968) extended the same logic beyond warrantless arrests. Officer Olson had obtained a search warrant for the defendant’s home and car based on an affidavit built almost entirely from secondhand information. Fellow officers had passed him intelligence they themselves had received from a confidential informant, who claimed marijuana would be at the residence on a specific date. Officers executed the warrant, found marijuana, and won a possession conviction.4FindLaw. People v. Scott (1968)
The Court of Appeal reversed. On the layered-hearsay question, it acknowledged that a magistrate can consider informant hearsay in issuing a warrant, provided the affidavit gives a substantial factual basis for trusting it. But relying on Harvey, the court drew the line: “hearsay upon hearsay could not, by itself, provide probable cause for an arrest without a warrant, and upon the same reasoning it could not by itself support issuance of a search warrant.”4FindLaw. People v. Scott (1968) Secondhand information could be part of the probable-cause picture. It could not be the whole picture.
The Federal Version of the Same Idea
The U.S. Supreme Court reached a similar conclusion in Whiteley v. Warden (1971). Police in Laramie, Wyoming, arrested a man based on a radio bulletin from another jurisdiction. The underlying warrant, though, rested on a complaint that lacked sufficient facts to establish probable cause.
The Court held that while officers are “entitled to act on the strength of the radio bulletin” and may assume the requesting officer supplied the magistrate with adequate information, “an otherwise illegal arrest cannot be insulated from challenge by the decision of the instigating officer to rely on fellow officers to make the arrest.” The Court also rejected any weaker standard for reviewing an officer’s probable cause assessment compared to a magistrate’s; the standards, it said, are “at least as stringent.”5Legal Information Institute. Harold Whiteley v. Warden, Wyoming State Penitentiary
In both California and federal courts, the practical result is the same. An officer in the field can trust a dispatch. That trust does not shield the arrest from later judicial review, and if the original basis was deficient, the arrest falls with it.
Raising a Harvey-Madden Challenge in Court
In California, the vehicle for challenging an arrest based on insufficient probable cause is a motion to suppress under Penal Code Section 1538.5. The motion asks the court to exclude evidence obtained through what the defense argues was an unreasonable search or seizure. It must be in writing, identify the specific items to be excluded, and set out the factual and legal basis for suppression.6California Legislative Information. California Penal Code 1538.5
The procedure runs in stages. The defendant first presents enough to suggest a constitutional violation occurred. The burden then shifts to the prosecution to show the arrest and search were lawful. In a Harvey-Madden challenge, that means producing evidence about the original source of the information: testimony from the dispatcher or reporting officer, certified communication logs, or corroborating circumstances.
Cases turn on this step. If the prosecution cannot call the dispatcher, produce the communication log, or otherwise trace the information back to a legitimate source, the arrest may be ruled unlawful. Section 1538.5 also lets the defendant preserve the issue for appeal after a conviction, even following a guilty plea, as long as the suppression motion was filed at some point before conviction.6California Legislative Information. California Penal Code 1538.5
What Happens If the Motion Succeeds
If a court grants a motion to suppress, the consequences reach beyond the single piece of evidence found on the scene. Under the exclusionary rule, evidence obtained through a Fourth Amendment violation cannot be used by the prosecution at trial.7Legal Information Institute. Fourth Amendment, U.S. Constitution That includes the direct evidence and anything else the police discovered as a result of the unlawful arrest, sometimes called “fruit of the poisonous tree.”
There are exceptions. Evidence may still come in if the prosecution shows it came from an independent source unrelated to the illegal arrest, or that officers would have inevitably discovered it through a separate lawful investigation already underway. Courts also recognize an attenuation exception when enough time or intervening events have passed to break the connection between the arrest and the evidence. Good-faith reliance on a dispatch can factor into the analysis, but it does not override a fundamentally baseless arrest.
When key evidence is suppressed, the prosecution often cannot sustain its case. That is the leverage the Harvey-Madden rule is meant to create. It pushes the government to maintain a provable chain of justification for every arrest that starts with one officer telling another what to do, because the cost of failing to prove that chain is losing the evidence at trial.