Which scenario would lead to pesticides classified as waste?

Pesticides can be classified as waste when they are no longer effective for their intended purposes. In the scenario where the pesticide has lost effectiveness due to prolonged storage, it can no longer perform its intended function of controlling pests. This loss of effectiveness typically occurs when the product is past its expiration date, has been exposed to inappropriate storage conditions, or has otherwise degraded.

In contrast, newly purchased pesticides that are stored properly remain viable for use, as do those that are currently in application or have been approved for use in agricultural contexts. These situations indicate that the pesticides are still functional and serve their intended purpose, thus they do not meet the criteria for being classified as waste.