It's lethal if you want it to be. The poison is designed to be released slowly, so non lethal if you don't. Which is why I assume you asked.

[How does this guy ever expect to win? It's not too late to demand the trap back.]

Just shut it closed again after a while if that's what you want. Reckon you could even hit the button at a distance with one of those sticks. Something tells me that aim wasn't accidental.