probable cause

American  

noun

Law.

1. reasonable ground for a belief, as, in a criminal case, that the accused was guilty of the crime, or, in a civil case, that grounds for the action existed: used especially as a defense to an action for malicious prosecution.

---

probable cause British  

noun

1. law reasonable grounds for holding a belief, esp such as will justify bringing legal proceedings against a person or will constitute a defence to a charge of malicious prosecution

---

Etymology

Origin of probable cause

First recorded in 1670–80

Example Sentences

The government said in court that the immigration sweeps are “based on reasonable suspicion and probable cause and the Constitution.”

From Salon • May 24, 2026

In order for charges to be filed, prosecutors would have to convince a grand jury, made up of members of the public, that probable cause exists to believe a crime has been committed.

From BBC • May 16, 2026

It also says warrants need probable cause and must be particular about the place to be searched.

From The Wall Street Journal • Apr. 26, 2026

A plaintiff like Gonzalez needs to show that law enforcement lacked even probable cause for an arrest.

From Slate • Apr. 6, 2026

I knew that he had no probable cause to enter my vehicle and that he was conducting an illegal search.

From "Just Mercy" by Bryan Stevenson