Well if you're talking about a screen mesh tank, that's different from a cage. When I read "cage" i thought of something akin to a guinea pig or rat enclosure (which, unfortunately, people have tried housing reptiles in).
Screen mesh enclosures (reptariums, i think they call them?) can be used, they say, but I read a lot about how snakes would rub their snouts raw against the screen mesh which caused a lot of problems and discomfort for the snake. These are better suited for chameleons and things that need extreme humidity and ventilation.