Argthtjtr

A few years back I traveled to the States with a valid ESTA to attend one of those coding workshops in the Bay area.

I disclosed this with the immigration officer at border control and I was let it without any problem.

The workshop lasted less than 90 days but according to ESTA regulations, I could have only attended it if the teaching lessons were less than 18/hours a week. Technically this was a full-time workshop, but we only got 1-2 hours a day of actual lessons and the rest of the time was spend with the other students to work on projects together.

The problem is that now, many years later, I found out that the same workshop is issuing M1 visas for its foreign students. Apparently, they are now requiring M1 or F1 visas to attend the workshop and at the time they didn't discourage me to attend the workshop with my ESTA.

Ever since then I traveled to the States many other times and I got issues other ESTAs without problems. So now, what are my risks? I'm actually now married to a US citizen and we plan on moving back to the States in a few years. What would be the potential implications on my situation to my green card application?

So now, what are my risks?

None. Are you going to walk up to an immigration officer and say some years ago I broke immigration rules that US Immigration does not know about? They will think you are probably going insane. Your violation was not willful and clearly you are remorseful.

What would be the potential implications on my situation to my green
card application?

None. Unless once again you go and rat out yourself. Why would you do that?

It sounds like you have only attended the workshop once, so you can tell the CBP officer (if asked) in full honesty that you have no way to compare the current workshop contents with the previous contents. The workshop may have the same title, sure, but coding is still an evolving field. There's more to teach today then there was 5 years ago. So you can't be entirely surprised if the workshop now takes a bit longer.

As Johns-305 points out, you are probably already seen as a low-risk traveller due to your past travel history. As long as there are no new issues they discover in the first few questions, they'll be focussing their attention on higher-risk travellers. And that means they won't spend an extraordinary amount of time on you.

Remember, you're probably seen as a low risk. That's because of two things; not only will they expect there's only a small chance that you suddenly break the rules, but besides probability the other contributor to risk is impact. If you were to break the rules this time, the assumption will be that it would be a minor infraction, not something bad like an indefinite overstay. To summarize bluntly: you're not a political problem.

This may seem like it is legal advice, and I am not a lawyer, but I wouldn’t go volunteering that I had violated the law, without some assurance that I had in fact violated the laws. Such as a judge telling me in open court that I had done so.

To the best of your knowledge at the time it was legal, don’t go second guessing yourself. I don’t see any advantage to you to blurting this out, and if accused of it, would respond that I believe I had complied with the law.