>>The compairison to cats and dogs and hogs is valid because they are a MUCH bigger problem and they realy are not doing anything about it.

Of COURSE "they" are doing things about cats and hogs. I can point you towards some of the control programs that are already in place if you really want to research them. But banning the importation of cats and/or hogs, or banning their interstate transport, would have no effect on the problem at this point. It's much too late for that, in their case.
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0.1 Peruvian rainbow boa (Amaru)
2.0 Brazilian rainbow boas (TBA)
0.3 Honduran milksnakes (Chicchan, Chanir, Hari)
2.6 corns (Cetto, Tolosa, TBA)
1,000,000.1,000,000 other critters