Wow that is creepy. That story sound like an urban myth kind of tale, but it was only second-hand for you so it sounds like it really did happen like that.
No, no I trust the young man implicitly and have no reason to question the authenticity of his story. Raids on importers of other animals have even been done, similar to a SWAT raid for things like non-native crayfish as Andrew pointed out. Even reading it in a reputable newspaper seems surreal I must admit.
Still, for an overburdened and underfunded agency I guess they keep their feelers out for the worst offenders trafficking in the most dangerous organisms, in Texas case crayfish, apple snails and Salvinia molesta
"You are much better off with no numbers than meaningless ones. The minute you believe numbers uncritically, that is, without understanding how they're calculated and how well they measure whatever they're supposed to measure, you will generate a breed of employee who will produce numbers and not results. Your data-processing system will then serve not to describe reality but to lie about it."
-Micheal S. Montalbano