For law enforcement, having probable cause means possessing a reasonable and trustworthy belief, based on facts and circumstances, that a crime has been committed or that evidence of a crime is present in a particular place. This standard is required before police can make an arrest, conduct a search, or obtain a warrant

. Probable cause is more than a mere suspicion or hunch but does not require proof beyond a reasonable doubt. It requires enough evidence that a reasonable person would believe a crime is occurring or that evidence will be found

. For example, seeing a person matching a robbery suspect’s description with stolen items in their possession can establish probable cause for arrest

. The concept balances an individual's right to privacy against the government's interest in public safety and order, ensuring that law enforcement actions are justified by concrete facts rather than speculation

. Probable cause can be established through:

• Observations by officers (e.g., witnessing a crime or suspicious behavior)
• Credible information or tips, provided the source is reliable and the information is detailed enough

• Evidence in plain view during lawful stops or investigations

It differs from reasonable suspicion, which is a lower standard allowing brief stops or questioning but not arrests or searches

. In summary, probable cause means law enforcement has enough trustworthy facts to reasonably believe a crime has been committed or that evidence is present, justifying arrests, searches, or warrants under the Fourth Amendment