CBP released a news report regarding a currency seizure in San Diego that stands out from most of the cases covered here — not because of the amount, but because of who made the seizure and where it happened. Here is what CBP reported:
At approximately 1:30 p.m., agents encountered a male Mexican national driver on Interstate 15 exhibiting suspicious behavior. Agents conducted a routine traffic stop and questioned the man. A subsequent inspection by a canine team resulted in an alert to the trunk of the 2000 Mercury Marquis. A search of the trunk revealed $43,000 in undeclared U.S. currency hidden inside a cardboard box that was located beneath a false floor. The 55-year-old man was arrested and turned over to Homeland Security Investigations. The vehicle and cash were seized by the U.S. Border Patrol.
Why This Case Is Different — Border Patrol, Not CBP Officers at a Port
Almost every currency seizure case I write about involves CBP Office of Field Operations officers working at a designated port of entry — an airport, a land border crossing, or a seaport. This case is different in two important respects. First, it was conducted by U.S. Border Patrol agents — a separate arm of CBP that operates between ports of entry, patrolling the interior corridors and highways away from the border itself. Second, the seizure occurred on Interstate 15 inside the United States, not at the moment of crossing.
Border Patrol’s jurisdiction extends beyond the immediate border zone. Under federal law and longstanding practice, Border Patrol agents can operate checkpoints and conduct enforcement actions within 100 miles of any U.S. international border or coastline. The I-15 corridor north of San Diego is well within that zone and is a known route for narcotics, currency, and human smuggling moving north from the Tijuana crossing. The I-5 checkpoint — also referenced in the release — is a fixed interior checkpoint that all northbound traffic on the coastal highway must pass through.
The False Floor — Prepared Concealment Away From the Port
The $43,000 was found inside a cardboard box beneath a false floor in the trunk — a fabricated void space designed to defeat a standard inspection. Currency hidden beneath a false floor is prepared, deliberate concealment of exactly the kind that defines bulk cash smuggling under 31 U.S.C. § 5332. The fact that the concealment was discovered by Border Patrol on a highway rather than by CBP OFO at a port of entry does not change the legal characterization of the violation. The statute applies to knowing concealment of currency with intent to evade the reporting requirement during transport — location of discovery is irrelevant to the elements of the offense.
The K-9 alert to the trunk is what initiated the physical search. Currency detector dogs deployed at interior checkpoints and during highway patrols alert to the scent of currency — often because large amounts of cash carry trace drug residue from prior contact with narcotics. The dog alert gave agents documented probable cause to search the trunk, which led to the false floor, which led to the cardboard box, which led to the $43,000. The evidentiary chain from alert to discovery is clean and well-documented before the driver had any opportunity to explain anything.
The Reporting Violation and the Interstate
One question that sometimes arises in cases like this one: does the FinCEN 105 reporting requirement apply if the person has already crossed the border and is driving on a U.S. highway? The answer depends on the direction of travel and the timing of the crossing. Under 31 U.S.C. § 5316, the reporting obligation arises at the time of crossing a U.S. border — entering or exiting. If this individual crossed northbound from Mexico into the United States at a San Diego port of entry without declaring the $43,000, the violation was complete at the moment of crossing, before he was ever on I-15.
The subsequent discovery by Border Patrol on the highway simply documented the currency that had already been transported across the border without being reported. Border Patrol’s authority to seize the currency and vehicle flows from the same statutory framework as CBP OFO’s authority at ports — the violation was committed at the border, and the seizure is the consequence of that violation discovered during interior enforcement.
Arrest and HSI Referral
The driver was arrested and turned over to HSI for further investigation — the same pattern we see in most bulk cash smuggling cases with clear concealment. A false floor in a vehicle trunk is not ambiguous. It is prepared infrastructure for moving contraband, and HSI treats vehicles equipped that way as instruments of organized criminal activity rather than the property of someone who simply forgot to file a form. The vehicle was seized alongside the currency, consistent with 31 U.S.C. § 5332(c)‘s forfeiture authority over conveyances involved in bulk cash smuggling violations.
The civil forfeiture of the $43,000 and the vehicle proceeds on its own track regardless of what HSI’s criminal investigation determines. A CAFRA Notice of Seizure will be issued, the election of proceedings deadline will run, and anyone with an interest in the currency or the vehicle will need to respond within 30 days of the notice date. Read our guide on why you must not contact CBP or HSI without an attorney after a seizure of this kind.
Has CBP or Border Patrol Seized Your Currency?
Whether your cash was seized at a San Diego port of entry, at an interior checkpoint, or anywhere else in the country, contact us for a free consultation. Read our customs money seizure legal guide or watch the video series. See our currency seizure case outcomes. Call us at (734) 855-4999, send a text message, or reach us on WhatsApp. You can also contact us online.