1. It is all honor based. For the most part, no real problem. At least, at larger events.
2. Most of the primary events require specific kit, or restrictions to. Mostly mid-low capacity mags, (30 rnds, or sometimes 100 rnds) only one SAW per squad, max velocity of bb, etc.
I got into it cause of the military. We used airsoft weapons once, and I checked it out later. Very mature group of players, from what I've seen. There are always exceptions, but I have loved every minute of playing.
I don't remember the link policy here, but just google search "Lion Claws airsoft". Op Irene is the big event, usually at either Mascatatuck, IN., or Zussman Village, Ft. Knox, KY. Very cool stuff.