Not all species in these genera are deadly but there are some nasty enough that florida wildlife requires a colubridae specific venomous permit to possess them. You should research these to broaden your ideas on rear-fanged serpents. One that'll likely jump out at you early on is the boomslang, Dispholidus, a rear fanged snake that will surely put a world of hurt on you with or without hypersensitivity.
Quote from FWC license page: http://myfwc.com/license/captive-wildlife/all reptiles in the family Colubridae belonging to the genera: Rhabdophis, Boiga, Dispholidus, Thelatornis, and Atractapsis









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