Thanks Bill, that was informative and there are some uses from which I've bennifitted without knowing. You are right... all it takes is one bad apple to spoil the bunch. Its the careless operations that concern me. Somehow, these operations need some kind of policies and proceedures in place to eliminate the "bad apples"before any damages can't take place. Another thing that concerns me is all these hobby farms that I see when I drive around that have exotic species roaming the premises. You know, zebras, gazelles, camels, unicorns and others. What kinds of problems can these non-native species bring with them?