Unless you are a US citizen or have a green card or other visa permitting you to work, you will run into the problem that small operations do not have the ability to get you the necessary visa (M-1 I think, there's a sticky thread that goes into all the details, which I forget).
Most small operations also don't care (though they WILL care about the TSA approval, which is completely separate). It's up to you whether you take the tiny but non-zero risk of the immigration people finding out, which is likely to result in a 10 year ban on entering the US.
n5296s