Probable cause and reasonable suspicion have evolved through state and federal court decisions, but they began in the us supreme court probable cause to arrest the fourth amendment to the united states constitution states that people have the right to be free from unreasonable searches and seizures.
Reasonable suspicion is a standard in law enforcement that is greater than thinking a crime has been committed but less than probable cause like probable cause, reasonable suspicion is subjective to the individual law enforcement officer, and there is no true legal definition.
Probable cause is a stronger standard of evidence than a reasonable suspicion, but weaker than what is required to secure a criminal conviction even hearsay can supply probable cause if it is from a reliable source or supported by other evidence, according to the aguilar–spinelli test.
Probable cause must come from specific facts and circumstances, rather than simply from the officer's hunch or suspicion detentions short of arrest do not require probable cause such temporary detentions require only reasonable suspicion. Find out more about the definitions surrounding probable cause and reasonable suspicion, the differences between the concepts, and how they apply to your constitutional rights.