Sheriff Joe and the illegal Mexican...corn

Sheriff Joe Arpaio has begun a crackdown on unlicensed food cart vendors. If you live in my neighborhood, or one similar, you know the guys. They sell elote (which, for those of you who don't live in neighborhoods like mine, is corn). Channel 15 caught Arpaio's deputies on tape checking people for their papers and detaining them if they could not prove their legal status in the United States - even if they are in the U.S. legally or are citizens. The man profiled (in the story, and I suppose, by the Sheriff's deputies) insisted he didn't have to say whether he was legally in the United States when he was stopped for having an unlicensed food cart. After hours in detention, he proved he was in the U.S. legally, and was let go. What is more funny is that Sheriff Joe says in the story that this is an issue because the corn is not just corn, but rather it comes from drop houses. Huh? It's illegal corn from drop houses? Perhaps Channel 15 cut the Sheriff off in that clip before he said something that actually made sense, or perhaps he is just really off his rocker. I suppose if the new rule is to ask to prove the legal status of anyone stopped by the Sheriff, then it has to be equally enforced. So if you are more fair skinned than me, and have been stopped by Sheriff's deputies lately and had to prove your legal status/citizenship, please post your story as a response on here. I want to know if the Sheriff's office is enforcing this policy equally. Most law enforcement agencies do check citizenship/legal status when arresting people (some only when arresting for felonies), but when confiscating an unlicensed food cart? Is that a bit extreme?