Am I Free to Go? Checkpoint America

l3JDUshLhTT63NNVUNITED STATES OF AMERICA: This “immigration checkpoint” is more than 350 miles away from any border in the U.S., also do they use dogs to sniff out people without their green cards? Why dogs?

I have very little info about this clip, if anyone can comment the location and names I’d Gladly add the names to this article,
A man and his wife approach a border checkpoint in a south western US border state and are asked whether or not they are indeed citizens. The driver refuses to answer and even is threatened with being detained until the border patrol officer was over ruled by his superior. Common harassment becoming the norm.