Genetically modified mosquitoes (which can't reproduce) offer a way to rid Florida of the mosquito's that spread Dengue and Chikungunya.

I think it is plausible that these mosquito's are a safe way to prevent those diseases from spreading, but there are many ways things could go wrong. Even though they are unlikely, they might conceivably have very bad consequences. I think it would be wise to investigate ways things could go wrong, to try to make them less likely, or demonstrate that the consequences would be bounded.