An immigration officer suspected that I was entering the US to work (although I was really entering the country as a tourist). He wrote the following into my passport and told me that I'd need to leave the country after 30 days, which I complied with.
What does his writing (black and on the left) mean? I suspect that it either says UOPI or UOFI -- if I am allowed to re-enter the US in the future on my B-2 visa, what steps can I take to make sure that, next time, I'm not suspected of entering to work?