I'm surprised when people are working (ie presenting at a conference) they think a non-working visa is OK. We all play the game, but to not know the game is su

I'm surprised when people are working (ie presenting at a conference) they think a non-working visa is OK. We all play the game, but to not know the game is surprising. Hack the system, sure. But know you are hacking at least. (I'm assuming OPs presentation was work related)