Most species of dart frogs are indeed toxic, but some, like the Aparasphenodon brunneus, are not toxic at all. The toxicity of dart frogs is largely due to their diet in the wild, which includes certain ants and termites that contain toxic compounds. In captivity, where their diet is controlled, many dart frogs can be raised without developing toxicity. Therefore, while the majority of dart frogs are poisonous, there are a few species and individuals that are not.
