FYI below copied from Wikipedia, sorry my Google skills are not that great. Now, someone putting their hands on their pocket during a conversation does not meet that standard.

"In United States criminal law, probable cause is the standard by which an officer or agent of the law has the grounds to obtain a warrant for, or as an exception to the warrant requirements for, making an arrest or conducting a personal or property search, etc. when criminal charges are being considered. It is also used to refer to the standard to which a grand jury believes that a crime has been committed in conjunction with a preponderance of the evidence. This term comes from the Fourth Amendment of the United States Constitution:

The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.

"Probable" in this case may relate to actual statistical probability, or to a general standard of common behavior and customs. The context of the word "probable" here is not exclusive to community standards and does not predate statistics, as some have suggested.[1]"