Am I being detained?

3 minutes

He is NOT being detained, but he is NOT free to go either.
All he has to do is to answer one simple question.
The DHS is asking for his citizenship.

It would have been nice if the driver had asked Agent Gonzalez for HIS citizenship - but that might have landed the driver in jail, so probably not a good idea.

Source
Also see below post - The US border has moved!!!!

CHECKPOINT USA

And here is Another Story

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In Laredo Texas, this violation of our rights is a way of life. Post 9/11, the questioning has gotten more invasive even after citizenship has been established and Fido hasn't alerted to anything illegal. But is immigration enforcement the true mission of the CBP? Apparently not, according to Carlos X. Carrillo, the BP chief in Laredo. The words straight from his mouth are:

"The Border Patrol's job is not to stop illegal immigrants.
The Border Patrol's job is not to stop narcotics.
The Border Patrol's mission is not to stop criminals.
The Border Patrol's mission is to stop terrorists and terrorist weapons from entering the country."

Read the whole story here

So there is an apparent internal conflict of the CBP mission. And if Carrillo's statement is true, then the pretense of questioning US citizens to enforce immigration law is false.