Are Poison Dart Frogs poisonous?

What makes a poison dart frog poisonous is what they eat in the wild.  In the wild they are eating ants and termites and various other insects that contain formic acid, the frogs then store the acid and alter it just slightly, which makes it a very potent neurotoxin.  This built up neurotoxin is then concentrated and secreted from their granular glands. 

When a frog is kept in captive conditions they are not exposed to the food that makes them toxic, so they are in fact not poisonous.