For purposes of this section, "reasonable cause to detain" requires that the circumstances known or apparent to the officer must include specific and articulable facts causing him or her to suspect that some offense relating to firearms or deadly weapons has taken place or is occurring or is about to occur and that the person he or she intends to detain is involved in that offense. The circumstances must be such as would cause any reasonable peace officer in like position, drawing when appropriate on his or her training and experience, to suspect the same offense and the same involvement by the person in question.
Ca. Pen. Code § 833.5