The American Civil Liberties Union defended the man in court, challenging the forensic search as a violation of his Fourth Amendment rights. The ACLU filed a “friend-of-the-court” brief and made oral arguments outlining how the amount of private data stored on smart phones and similar devices should require the government to get a search warrant from a judge. “At the very least, border agents must demonstrate good reason to believe the traveler was violating the law before conducting the search,” the ACLU writes. “We urged the court to reject the government’s argument that cell phones should be treated the same as regular luggage, which border authorities are routinely allowed to search without a warrant or any individualized suspicion.”

In their ruling the court agreed with the ACLU, stating that “a forensic border search of a phone must be treated as non-routine, permissible only on a showing of individualized suspicion.” The court elaborated on this statement in their opinion:

While an international traveler can mitigate the intrusion occasioned by a routine luggage search by leaving behind her diaries, photographs, and other especially personal effects, the same is not true, at least practically speaking, when it comes to smartphones and digital devices. Portable electronic devices are ubiquitous – for many, the most reliable means of contact when abroad – and it is neither “realistic nor reasonable to expect the average traveler to leave his digital devices at home when traveling.”

The ruling from the Fourth Circuit joins earlier decisions from the Ninth Circuit Court of Appeals, the Eleventh Circuit, and a Fifth Circuit judge regarding whether traditional rules for warrantless border searches should apply to electronic devices. The Ninth Circuit found that at a minimum “reasonable suspicion” was needed for forensic searches of electronic devices. Two judges with the Eleventh Circuit found that the searches of digital devices should be treated like searches of luggage which do not require a warrant. A third judge in the Eleventh called for a warrant requirement. The Fifth Circuit judge was skeptical of applying traditional rules to electronic devices, but the court declined to rule on the matter.

The ACLU and the Electronic Frontier Foundation are currently engaged in a lawsuit against the federal government on behalf of 11 people who had their phones and laptops stolen and searched by federal agents when coming home to the United States. The lawsuit is attempting to force the courts to require a warrant based on probable cause before searching travelers and violating their Fourth Amendment rights. The ACLU writes that a decision in that case should come in the coming months. In addition, the Electronic Privacy Information Center has filed a Freedom of Information Act lawsuit against the U.S. Immigration and Customs Enforcement regarding the agency’s use of forensic technology designed to hack cellphones. EPIC is attempting to clarify how ICE uses the devices to conduct warrantless electronic searches of cellphones and laptops along the U.S. border.

Documents previously released to the ACLU under Freedom of Information Act requests revealed that Border Patrol agents searched over 6,500 people from October 2008 to June 2010. This data from the Department of Homeland Security also shows that an astonishing 5,000 people were searched along the border in February 2017. In response to these searches, four members of Congress introduced legislation that would require border agents to get a warrant before performing a search of someone’s cell phone, laptop, or tablet. The bill was simultaneously introduced by Senator Ron Wyden and Representatives Jared Polis and Blake Farenthold. If the measure becomes law, it will require border agents to have probable cause and a warrant before accessing the contents of a device belonging to a U.S. citizen or permanent resident. The bill also makes it clear that agents cannot hold individuals for more than four hours in an attempt to force them to unlock their devices.