The requirements for probable cause are:
Specific and articulable facts: There must be specific and articulable facts that would lead a reasonable person to believe that a crime has been committed and that the person to be arrested or the location to be searched is connected to the crime.
Reasonableness: The belief that a crime has been committed must be, without any reasonable doubt, taking into account all of the circumstances surrounding the preponderance of the evidence available, including the knowledge and training of the law enforcement officer and the specific facts of the case.
Factual basis: The law enforcement officer must have a factual basis for their belief that a crime has been committed and must be able to explain the reasoning behind that belief.