Hi Paul!
I couldn't find Pitcher Plants listed on any of my toxic plants tables, so it looks like you can use them in a chameleon set-up. It's my understanding that most Pitcher Plants grow in bog-like, acidic soils so I don't know how well they would grow in a chameleon enclosure?!!?
Personally I wouldn't use these plants in any of my enclosures. Some of my chameleons are voracious plant eaters and I'm not sure I would trust the disgestive fluids of the plants as being safe.
Cheers!
Trace