Which of the following is true regarding allowable pesticide residues?

The correct choice emphasizes that pesticide residues must be within established tolerance levels. Tolerance levels are scientifically determined limits set by regulatory agencies, such as the Environmental Protection Agency (EPA), based on safety evaluations. These limits ensure that any pesticide residues present on food do not pose a risk to human health when consumed. Maintaining residues within these established levels is essential for compliance with food safety regulations and for protecting public health.

In contrast, while testing for residues after each harvest may occur in certain contexts, it is not a universal requirement across all crops or every harvest. Regarding organic crops, there are indeed strict restrictions on pesticide residues, meaning that the assertion about no restrictions is inaccurate. Additionally, while pesticide residues can degrade over time, suggesting they are irrelevant ignores the fact that these residues can have significant implications for health and environmental safety. Therefore, the focus on tolerance levels captures the essence of regulatory compliance and safety in pesticide use.