who knows? If the LWB openly or frequently use it enough over a period of time, they -could- eventually be identified by it. This may not -necessarily- mean they're contraband, just strictly regulated as "soft" contraband... unless the LWB soon monopolize Blue Jillies as exports, which then means it'll become "hard" contraband like Blood Diamonds (in my own terminology, where soft = NPC's don't register it as contraband, but player-police should be wary, NOT hostile, if they scan a ship full of them; hard = NPC's do also register them as contraband, and destroy/capture on site).
another note is that they're allegedly rare, so it would make sense that police would grow suspicious as to where you're bringing them.