i'm going and was either going to bring them with me if they're legal, or hope to find some there at a headshop...i'm afraid to bring real drugs that far while whether i fly or drive.
I'm pretty sure a street level cop/TSA agent won't know whats legal and what isn't legal. All they know is that anyone carrying a suspicious white powder/crystals is subject for further investigation.
Your best bet is to either not bring them, or repackage the substance of choice in a capsule of choice hidden in a bottle of choice filled with other capsules.
Legal and location specific question aren't approriate for the Other Drugs Forum. You can perhaps try over in NASADD with a more concrete question but I'm just going to close this thread as RC can mean basically anything and just because you can order plant food online or buy bath salt from a shop without getting caught doesn't mean that some of the ingredients are illegal or illegal under an analogue act and you'll get charged for trying to fly with them.