Great resource here for CCW in MD and all US states: http://handgunlaw.us/
(Click the state on the map, and it pulls up a really nice pdf of all CCW laws and interpretations)
I'm not trying to inflict pain or cause injury, if it gets to the point that I'm having to pull my weapon it means either my life is going to end or their life is going to end.
That is not what the sign says.
It says that is the DEVICE was DESIGNED to inflict pain or cause injury.
NOT the intent of you carrying it.