my friend !does me this and I don't know answer, he has a non- immigrant b and work permit, and has plans to visit Ventienne, Laos, does he need a re-entry permit to avoid voiding his visa??
TLDR : Answer Summary
Your friend with a Non-Immigrant B visa and work permit may need a re-entry permit depending on his visa type. If he holds a Single Entry Non-Immigrant B visa, he will need a re-entry permit to avoid voiding his visa when leaving Thailand. However, if he has a Multiple Entry Non-Immigrant B visa, he can return without a re-entry permit as long as he comes back before the visa's expiration date.