Pesticides may become unusable for many reasons, even simply because the person possessing them no longer has a use for them. Some products have a limited shelf life, or may undergo changes in storage that render them unusable. Identifying labels and use directions deteriorate with age, often to the point of becoming unreadable or completely missing. Many liquid products become unusable after being frozen, for example, and many dry formulations like dusts or granules may become unusable if they get wet. In some cases pesticides become unusable because their registrations are expired or canceled, and legal uses for them no longer exist. It is also not uncommon for people who inherit or purchase agricultural properties to find unusable pesticides in storage. All of these circumstances make pesticides unusable, and all of these examples are suitable for the MDA disposal program. If you have questions about the use, status or condition of a pesticide, contact the Montana Department of Agriculture at (406)-465-0531. It is helpful, but not necessary for participation, to provide the product's name, manufacturer, and U.S. EPA registration number found on the product's label.