I’ve noted before that people get nervous when stopped and questioned by the police. Being nervous is not by itself a sign that the person is lying or a criminal or doing something wrong. Although of course NCIS/OSI/CID will often say it is so.
As the writer notes here,
The very presence of a police officer is, in most cases, enough to unnerve the general public. Think about how you respond when a police car appears in your rearview mirror.
Court-Martial Trial Practice Blog


