Discretion in carry would appear to be the way to go. If you need to display the handle & sheath and would run afoul of the law there are enough chinese knockoffs where you could glue the thing together or snap the blade off and seal the handle to the sheath.

Having worked in public safety and always having a working blade upon myself even in Air Terminals, it got interesting. Jurisdictions and duties overlap and all. Still if in doubt leave the Sgian Dubh home or locked in the car. Still most LEOs I've dealt with understood the nature of the small knife was more ornimental than functional. That being the case a museum replica shop near Atlanta GA sells a sgian with an unsharped ornimental blade. Makes an OK letter opener but a really poor knife.

Don't wear one to the County Court House, or District Justice Hall. the Bailiffs don't like it either.