Yes Devin, Roy did drugs, there's no need to bring it up ALL the time...
And people MIGHT be less inclined to recall his history with drugs if he didn't have a cannabis leaf design on his chest! (Okay, I know it's suppose to be some sort of arrow/spear head, but that's not what I see when I look at it, and I've never even done drugs of any sort.
As for Lian with guns (and especially a handgun that appears to be longer than Roy's thigh) I can see Dinah's point about (Sure, THESE one's aren't loaded, but has he taught her to check the chambers/clip before playing with them... actually, I can see where he might do that and she'd make it look cute)
And may we assume that Roy actually DID something about the father threatening the child in the ER waiting room, or did he view that as standard parenting technique from Ollie?