Final answer:
Pesticides can be classified as restricted use or general use (unclassified), with restricted use pesticides requiring special training or certification to purchase and use.
Step-by-step explanation:
Pesticides can be classified as either restricted use or general use (unclassified). Restricted use pesticides are those that have greater potential for harm and require special training or certification to purchase and use. These are typically used by professionals in agricultural or commercial settings. General use pesticides, on the other hand, can be purchased and used by the general public without any special training or certification.