Which of the following must occur in order to use another's license to purchase pesticides?

The correct understanding revolves around the legal implications of using another person's pesticide license. In general, pesticide licenses are personal and tied to the individual who has met the certification and training requirements established by regulating bodies. When someone uses another's license, it bypasses these requirements and can lead to unauthorized use, which is against the law.

Regulations are strict regarding pesticide application to ensure safety for the environment and public health. Therefore, using someone else's license is not permitted and is classified as illegal, as it undermines the integrity of the licensing system designed to ensure that only qualified individuals handle potentially hazardous materials.

While there may be specific scenarios under which pesticide application could be shared (such as in a business context where employees may operate under a company license), these do not apply universally and would not justify the informal use of an individual’s license. Hence, it's crucial to understand that adherence to legal protocols regarding pesticide licensing is paramount for maintaining safety standards.