Im actually curious to the answer of this question too. I have a passport but have wondered about this myself. I was under the impression that if you're a citizen or were born in the country that they couldnt deny you re-entry into the US for any reason. I know they will give you shat for it but still let you in regardless. People have asked me if they can still go to Rocky Point without a passport and I tell them yes. I tell them ICE is going to scold you and give you the make sure you have it for next time deal but they will still let you in. This past Sunday the 29th a person in our group that came with us didnt have her passport because she hadnt received it in the mail yet but still came anyways. She rode back to AZ with me in my truck and when we pulled up she handed over the documentation stating she had purchased a passport and was waiting for it, had a picture ID (AZ drivers license) and social security card. The ICE agent was questioning her why she had gotten her passport from ASU and not the post office. Like seriously WTF does it matter where you purchased your passport?! I didnt get my passport from the post office, so why even ask that question, to put your nuts on someones face to let us know you have power?! Amirite?! Obviously everything was good and then for good measure the guy asks why I have two spare tires, one of which is mounted in the bed of my truck and is a full size 33...
hahahaha....they love to act tough to the people who are legitimately trying to help them prove their citizenship.
Last time I came back, my buddy didn't have his passport. He had gone through the trouble to get an original birth cert, had his social security card, and his driver's license.
The US BP agent looks at it all, yells at him for no passport and then says, "Your birth cert and DL says you are from Kansas. We ain't in Kansas anymore son. Where's your passport? And do you even know where Kansas is??"
My friend can be quite the smartass, so he looks the agent in the eye and says, "Yeah. Buddy. Take your finger. And put a dot smack dab in the middle of the U. S. of F*cking A. You'll find Kansas there." LOL
BP smiled and waived us back in.