"After doing a little research, this is from Missouri Supreme Case #SC90978 that was published March 1st, 2011
The existence of "reasonable suspicion" is determined objectively by asking "whether the facts available to the officer at the moment of the seizure warrant a person of [*9] reasonable caution in the belief that the action taken was appropriate." Pike, 162 S.W.3d at 473 (quoting Terry, 392 U.S. at 21-22). While this standard does not rise to that of the traditionally required probable cause, a proper Terry stop must be supported by "some minimal level of objective justification." State v. Johnson, 316 S.W.3d 390, 395 (Mo. App. 2010) (quoting State v. Lanear, 805 S.W.2d 713, 716 (Mo. App. 1991)). "The [reasonable suspicion] that will justify the minimally intrusive 'Terry' stop is present when 'a police officer observes unusual conduct which leads him reasonably to conclude in light of his experience that criminal activity may be afoot.'" State v. Mack, 66 S.W.3d 706, 709 (Mo. banc 2002) (quoting Terry, 392 U.S. at 30) (emphasis added).
A Terry stop is more than just a frisk for weapons. It is an investigation hinged upon an officer's reasonable suspicion and, consequently, a Terry stop detainee may be asked "a moderate number of questions to determine his identity and to try to obtain information confirming or dispelling the officer's suspicion." Berkemer v. McCarty, 468 U.S. 420, 439 (1984). [*14] To that end, in Hiibel v. Sixth Judicial District Court of Nevada, 542 U.S. 177, 186 (2004), the Supreme Court ruled that "questions concerning a suspect's identity are a routine and accepted part of many Terry stops." See also section 84.710 (if he possesses reasonable suspicion, an officer may demand a suspect's "name, address, business abroad and whither he is going."). "In Michigan v. Long, 463 U.S. 1032 (1983)
Yeah, so be ready to ID yourself when you get stopped. If you read the entire case, the Missouri Supreme Court really has no doubts about how they stand on this. If the cop can show "unusual conduct" you have to give up your identity. Is open carrying unusual conduct? That is sure what the cop will say. He will also probably say he was concerned a robbery or shooting was about to occur."