7.08 Fourth Amendment — FalsAcreses— - Definition of "Probable Cause" is a term used to determine if a police officer has reasonable grounds to make an arrest. Probable cause is an objective standard that must be satisfied in order for an arrest to be lawful. It requires that the officer has sufficient evidence to believe that the suspect has committed a crime. The standard is based on the facts and circumstances known to the officer at the time of the arrest. The two main types of probable cause are reasonable suspicion and probable cause proper. Reasonable suspicion is based on a lower standard than probable cause proper, and it requires that the officer has some articulate facts that the suspect may have committed a crime. Probable cause proper requires more facts and evidence and the officer must show that there is a fair probability that the suspect is guilty.