When the Police Can Make an Arrest: Probable Cause

"Probable cause" requires more than a mere suspicion that a suspect committed a crime, but not an absolute certainty.

Defend your rights. We've helped 95 clients find attorneys today.

There was a problem with the submission. Please refresh the page and try again
Full Name is required
Email is required
Please add a valid Email
Phone Number is required
Please add a valid Phone Number
Zip Code is required
Please add a valid Zip Code
Description is required
By clicking "Find a Lawyer", you agree to the Martindale-Nolo Texting Terms. Martindale-Nolo and up to 5 participating attorneys may contact you on the number you provided for marketing purposes, discuss available services, etc. Messages may be sent using pre-recorded messages, auto-dialer or other automated technology. You are not required to provide consent as a condition of service. Attorneys have the option, but are not required, to send text messages to you. You will receive up to 2 messages per week from Martindale-Nolo. Frequency from attorney may vary. Message and data rates may apply. Your number will be held in accordance with our Privacy Policy.

You should not send any sensitive or confidential information through this site. Any information sent through this site does not create an attorney-client relationship and may not be treated as privileged or confidential. The lawyer or law firm you are contacting is not required to, and may choose not to, accept you as a client. The Internet is not necessarily secure and emails sent through this site could be intercepted or read by third parties.

Probable cause is the key issue in the arrest process. Under the Fourth Amendment, the police need probable cause to make an arrest or obtain an arrest warrant from a judge.

(For more information on the probable cause concept, see How much "probable cause" do cops need? For an explanation of the standard needed for a detention, rather than an arrest, see What is reasonable suspicion?)

Establishing Probable Cause

To establish probable cause, police officers must be able to point to objective circumstances leading them to believe that a suspect committed a crime. A police officer can't establish probable cause by saying only something like, "I just had a hunch that the defendant was a burglar."

Judges, not police officers, have the last word on whether probable cause exists. A police officer may be sincere in believing that the facts establish probable cause. But if a judge examines that same information and disagrees, then probable cause does not exist (or did not exist, if the question is being decided after an arrest).

Note that probable cause may have existed at the time of an arrest even if the defendant didn't actually do anything wrong. Put differently, an arrest is valid as long as it is based on probable cause, even if the arrested person is innocent.

How Much Information = Probable Cause?

The million-dollar question is: How much information do police officers need to convince a judge to issue an arrest warrant or to justify a warrantless arrest? In general, probable cause requires more than a mere suspicion that a suspect committed a crime, but not as much information as would be required to prove the suspect guilty beyond a reasonable doubt.

Because probable cause is an abstract concept, a firm definition of it is evasive. Courts have to determine case by case whether there is or was probable cause for an arrest.

Examples of Probable Cause

Example: Officer Furman arrives at Simpson's Jewelry store moments after it's been robbed He sees broken glass inside the store. A man claiming to be Simpson, the owner, is on the scene. He holds what look like keys to the store and seems distressed. He tells Furman that a man, approximately 6'5" tall and weighing over 300 pounds, held up the store at gunpoint and escaped with rings and watches in a small brown paper bag. A few minutes later, less than a mile away from the jewelry store, Officer Furman pulls a car over for speeding. The driver matches the description of the robber, and on the seat next to him is a small brown paper bag and a couple of watches with the price tags attached. Though Officer Furman did not see the robbery itself, the driver matches the unusual physical description of the robber and has property that looks like what Simpson said was missing. Furman has probable cause to arrest the driver.

Example: Same case. Assume that the person claiming to be Simpson, the jewelry store owner, was actually the robber's accomplice. The accomplice gave Officer Furman a phony description and then fled after the officer drove off. The driver pulled over by the officer for speeding is later able to prove that he is the lawful owner of the watches that the officer saw on the seat. In this scenario, the broken glass corroborated "Simpson's" statement that a robbery had occurred, and Officer Furman had no reason to doubt the word of the person claiming to be Simpson. Thus, the officer had probable cause to make the arrest, even though the information turned out to be incorrect.

Example: Officer Seesit pulls over a car and its three occupants for speeding. The officer searches the car (with the driver's consent) and finds baggies of cocaine stashed behind an armrest in the back seat. All three occupants say they didn't know the cocaine was in the car. Seesit has probable cause to arrest the car's occupants. In the absence of evidence demonstrating that the cocaine belonged to a specific occupant, the officer could reasonably conclude that all of them knew about and possessed the cocaine. (Maryland v. Pringle, 540 U.S. 366 (2003).)

DEFEND YOUR RIGHTS
Talk to a Defense attorney
We've helped 95 clients find attorneys today.
There was a problem with the submission. Please refresh the page and try again
Full Name is required
Email is required
Please add a valid Email
Phone Number is required
Please add a valid Phone Number
Zip Code is required
Please add a valid Zip Code
Description is required
By clicking "Find a Lawyer", you agree to the Martindale-Nolo Texting Terms. Martindale-Nolo and up to 5 participating attorneys may contact you on the number you provided for marketing purposes, discuss available services, etc. Messages may be sent using pre-recorded messages, auto-dialer or other automated technology. You are not required to provide consent as a condition of service. Attorneys have the option, but are not required, to send text messages to you. You will receive up to 2 messages per week from Martindale-Nolo. Frequency from attorney may vary. Message and data rates may apply. Your number will be held in accordance with our Privacy Policy.

You should not send any sensitive or confidential information through this site. Any information sent through this site does not create an attorney-client relationship and may not be treated as privileged or confidential. The lawyer or law firm you are contacting is not required to, and may choose not to, accept you as a client. The Internet is not necessarily secure and emails sent through this site could be intercepted or read by third parties.

How It Works

  1. Briefly tell us about your case
  2. Provide your contact information
  3. Choose attorneys to contact you