Should Someone with a Cancelled Work Visa Handle Immigration Issues Before Leaving Thailand?

How was he allowed in with a canceled visa? The visa sticker would have a marking or written/stamped "used" on top. Do you in stead mean he had an extension from a non b with a reentry permit? A stamp from an immigration office that is. In that case maybe it wasn't actually cancelled, and he would be on overstay now. Even though they stamped him in again, the base for that stamp was no longer valid, if he did not work anymore.

I left and came back on tourist visa long ago but wouldn't recommend it if plan for a future in thailand.