When I was an LEO in Tennessee, it was common knowledge among LEOs that the state's 'Walking Horse' tags were favored by crack dealers. The weed growers favored the 'Agricultural' plates.
In Alabama, it's painfully evident that the same element has 'adopted' the 'GBA' and 'Helping Schools' tags. This has been verified through personal conversation with the local DTF (Drug Task Force).
The 'drug/gang element' uses these 'identifiers' as a 'tongue-in-cheek' means to 'thumb there noses' at LEOs.