Essentially, this is the civil society version of a work-to-rule strike.
Don’t do more than is expressly asked of you, and do what you are asked with such an intense attention to protocol that not asking you at all becomes more effective than even bothering.
“Have you seen an illegal immigrant?”
“Could you describe an illegal immigrant, officer?”
*officer describes a person who is in the country without appropriate paperwork, or who has crossed the border illegally*
“No, sir, I haven’t seen any illegal immigrant.”
And this is correct. You have NOT seen an illegal immigrant, because you have no way of knowing if Jose Fulano is here legally or not. And since you can’t see his paperwork (or lack thereof), and did not personally see him cross the border illegally, you are only answering precisely the question asked.