Уловка-22

[stillwhatever]

Instead, agents typically used the itinerary information to approach the unknowing passengers and ask if they would be willing to answer a few questions. From there, the conversation would diverge into the agent eventually asking to search the suspect. While the alleged suspect is free to decline that request, the refusal to be searched can constitute probable cause, which the agent can use to conduct a search regardless of consent.

https://mises.org/blog/dea-seizes-200-million-travelers-using-travel-records