[Rick Lee]

Even in states without such laws, a cop can still walk up to you and ask for ID. If you don't know you don't have to produce such, then that's too bad. If you tell him you don't wish to speak with him and want to be on your way, you're covered. If you tell him to eff off, he then has you for disorderly conduct (at the least) and can detain you until your identity is verified. In this case the guy was walking in the middle of a road, which would scream out "public intox" to me and therefore be RAS for a contact.