What message does this political cartoon convey? What is the evidence? What was the purpose of this message?

the available body of facts or information indicating whether a belief or proposition is true or valid.

There are three purposes for a message: inform, persuade or goodwill. The first purpose is to inform where a message can be used to communicate routine, repetitive, daily tasks, instructions, codes, steps and procedures in the workplace.

Explanation:

answer; the f b i. the drug enforcement administration(dea); the bureau of alcohol, tobacco and firearms and explosives; u.s postal inspection service;