A restricted use pesticide must be?

A restricted use pesticide is specifically labeled as such and is designed to be used only by certified individuals who have undergone proper training. This certification ensures that the user has the necessary knowledge and skills to handle these pesticides safely, minimizing potential harm to humans, wildlife, and the environment. The requirement for user certification helps to control and limit the application of these pesticides, as they may pose risks if not used correctly.

In contrast, the other choices do not align with the regulations governing restricted use pesticides. For example, labeling a pesticide as non-toxic does not necessarily qualify it as a restricted use pesticide, and allowing unrestricted public access contradicts the very essence of what makes a pesticide "restricted." Additionally, unrestricted usage in unlimited quantities would pose significant safety risks, which is why certified use is mandatory.