Hmm. Well just like in the game, I was basing off what you can and cant sneak into the casinos depending on your characters sneak. Abigail for example has switch-blade/knuckleduster hidden on her since she's more proficient at it. Brooks on the other hand can't hide his weaponry for shit.

Besides, Abigail and Brooks are pretty much nobodies in New Reno, and no one in their right mind would let people they've never seen or heard of before waltz around in their casinos packed with rifles and shotguns.