Ive heard customs sometimes doesn’t understand the difference between a conference and working, so if you have a tourist visa and they hear you plan to “work” y

Ive heard customs sometimes doesn’t understand the difference between a conference and working, so if you have a tourist visa and they hear you plan to “work” you will spend the night in jail and return to your point of origin. Sadly I’m not sure that I can see this getting better anytime soon.