I do believe the reason they are not permitted is because they are considered excessively dangerous to the ecology of the country. I do believe it was Guam who's bird population was desimated when boiga irregularis found their way to it.

Mike
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1.1 Cal. Kings
1.0 Ball Python
0.0.1 Jungle Carpet Python
0.0.2 African House Snakes
0.0.1 Oketee Corn Snake
0.1 Salmon Boa Constrictor
0.0.1 Marbled Salamander
0.0.1 Japanese Fire-Bellied Newt
0.2 Labs