Probably citrus quarantine blowback. Citrus greening, citrus canker and Mexican fruit flies, but citrus greening is the big one. Citrus greening affects pretty much every thing grown in the Rio grande valley. It's probably no longer worth the hassle to have your citrus certified ok to export out of the quarantine zone.
No fruit, trees, seeds, cuttings etc. if you get caught and proven that the citrus tree you have in your possession came from quarantine zone, it's some sort of major federal case because it can potentially affect all citrus, private and commercial.