I dont think a complete ban on Importation is in order. That doesnt mean that there arent possible issues to worry about with wild-caught and captive hatched specimens.

First, it is my understanding that "captive hatched" does not necessarily reduce the number of pathogens associated with imports, as ticks have been observed to move into clutches of eggs to await hatching of the neonates. The ticks in turn could carry nasty parasites.

These pathogens do not necessarily only pose a risk to the CH ball pythons themselves. If CH ball pythons are dumped by their owners, they pose a risk to reptiles native to the US. There is also a possibility that the pathogens could affect other categories/taxa of wild and domestic animals such as mammals or even humans. Some Zoonoses associated with ticks on exotic reptiles include tularemia, Siberian tick typhus, and tickborne relapsing fever.

There's a pretty extensive ban on the importation of three species of African tortoises. These species were found to carry ticks that harbor Heartwater disease after their importation. Heartwater disease effects ruminants, anything from livestock cattle to white-tail deer.

It has been recommended that both captive-hatched and wild-caught specimens be certified free of external parasites such as ticks. Some go as far as suggesting that the US spray all exotics with a safe pesticide. They argue that's it better to be proactive rather than reactive as in the case of Heartwater disease.

The costs of the increased quarantine time could then be passed on to the customer. This would make CH and CBB more comparable in price.

If you want to read more about these issues, see Reed, R. "An Ecological Risk Assessment of Nonnative Boas and Pythons as Potentially Invasive Species in the United States" Risk Analysis Vol. 25: No. 3. (2005)
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The other possible issue with imports is more of speculative question on my part. Ball Pythons are not endangered in Africa as already pointed out, they are such a nuisance in parts of Africa considered their native range that many of those governments consider them invasive. Still I wondered a little about the genetic management of the wild population. If every aberrant looking bp is sucked up and imported out for the pet/breeding trade, couldn't this result in a genetic bottleneck for the species?