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Of the documented 53 established non-native amphibian and reptile species (Table), at least 5--spectacled caiman (Caiman crocodilus), marine toad (Bufo marinus), African clawed frog (xenopus laevis), bullfrog (Rana catesbeiana), and brown tree snake (Boiga irregularis)--have been established at least 30 years and have been sufficiently monitored to enable preliminary assessment of impacts on the native biota.
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bullfrog (Rana catesbeiana) ?
What bullfrogs are native to the eastern U.S.
My reference: Ernst, Carl H. & Evelyn M. 2003. Snakes of the United States and Canada. Smithsonian Institution Press, Washington D.C. 668 pages. lists the Boiga irregularis as a potential threat. May be it depends on which islands one considers part of the U.S. Or perhaps Carl doesn't want to admit defeat.
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From State of Florida:
Snakes
Javan Filesnake Acrochordus javanicus 1970s Not reported breeding Unknown
Common Boa Boa constrictor 1990 Less than 10 years Potentially Established
Burmese Python Python molurus bivittatus 1980s Not reported breeding Not Established, Present
Brahminy Blind Snake Ramphotyphlops braminus 1979 At least 10 years Established
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It's my understanding that a species isn't considered "established" unless it breeding and showing signs of population stability or growth.
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Most of the information was ambiguous and little is really known. I have found Savanaah Monitors in FL.
Of course, we need more field herpers tromping through swamps. 
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But were the monitors you caught 2nd or 3rd generation monitors from wild Floridian monitors?
