By allowing the Border Patrol to conduct warrantless searches aboard buses, the Greyhound company is ignoring its customers privacy, Professor Anil Kalhan said in an article published in the Huffington Post on April 24.

The article cites an increase the frequency of Border Patrol officers boarding Greyhound buses and asking to see passengers’ papers—and the fact that the company has declined to raise objections.

The U.S. Customs and Border Protection agency, contends it has the authority to search for “aliens in any vessel,” the article notes, adding that Greyhound says it must comply.

Kalhan said, however, that the company could defend its customers’ privacy, just as Apple has resisted demands to provide the FBI with access to locked iPhones.

Greyhound’s stance, Kalhan said, is “that they’re not making an affirmative choice here, that they’re agreeing to the CBP entering because they have to, and that’s not the case. I think that is obscuring the fact that they’re making this choice.”

Kalhan, an authority on immigration law, is chair of the Association of American Law Schools’ Section on Immigration Law.