How to Reduce the Risk of a US Customs Exam on DDP Shipments

You cannot guarantee that a shipment avoids a US customs exam — CBP selects cargo using risk scoring, random sampling and requests from other agencies, and the selection method is not public. What you can control is the information you feed into that system, how consistent your documents are, and how quickly you respond when a container is held.

What an Exam Actually Means

“Selected for exam” covers four very different events, from a paperwork check to a full unpacking:

• Document review — CBP questions the entry package itself: classification, value, origin, invoice details. Nothing is opened; the cargo can be delayed while answers are provided.
• VACIS / non-intrusive inspection (NII) — an X-ray-type scan of the container at the terminal, without breaking the seal. Usually the quickest physical check.
• Tailgate exam — officers open the container doors and look inside. If something looks wrong, it escalates.
• Intensive exam — the container is moved to a Centralized Examination Station (CES), unpacked and inspected item by item. This is the slow, expensive one, and it can take days to weeks depending on the port.

A separate agency can also flag the cargo — food and cosmetics, plant products, wildlife items and consumer products draw scrutiny from agencies beyond CBP, and those reviews follow their own timelines.

Who Gets Selected, and What Nobody Can Control

CBP scores incoming shipments for risk, and a portion of selections are effectively random. Industry practitioners commonly refer to physical exam rates in the low single digits in ordinary years, with selection rising since 2025 as trade remedy and forced labour enforcement expanded. Treat any specific percentage you see — including those in this article — as an industry estimate rather than a CBP-published figure.

There is no legitimate way to influence selection: anyone promising “guaranteed no exam” is either guessing or overselling. What follows is the part that is genuinely within an importer’s control.

The Risk Factors You Can Control

ISF filed late or wrong. The Importer Security Filing must be transmitted accurately at least 24 hours before loading. Late or sloppy ISF data is one of the most-cited predictors of being pulled aside.

Classification that does not hold together. The same product landing in different HTS codes across shipments, or a code that does not sit comfortably against the USITC Harmonized Tariff Schedule, is exactly the kind of anomaly a targeting system is built to find. Mixed cartons, where one blanket code hides several different products, are where this most often goes wrong.

Declared value that looks wrong. Values far below market comparables, sudden drops between shipments, or patterns that look like invoice splitting all raise risk — and undervaluation is now an explicit enforcement priority under Executive Order 14411.

Documents that disagree with each other. Invoice, packing list, bill of lading and entry should tell one story: same description, same quantity, same value, same weights. Mismatches are the cheapest problem to fix and the most common reason a shipment gets a second look.

Everything being new at once. A new importer, a new supplier and a new product in the same shipment means no history to vouch for you. Spread firsts out where you can.

Categories under active scrutiny. High Section 301 exposure or forced-labour supply chain concerns are verified more often. These goods are not un-importable, but they should never be the shipment you treat casually.

Branded goods without authorization. If your product carries a trademark, the shipped goods should be able to answer the question on the spot — the party who can produce authorization when asked is in a very different position from the one who has to go and find it. Intellectual property questions are one of the fastest routes to a hold.

What an Exam Costs, and Who Pays

The exam itself, the transfer to a CES, the trucking, the storage and slow container turnaround are real costs, and under US customs practice they are charged to the importer’s side of the transaction. The specific allocation depends on your contract.

This is where the scope question in our DDP mistakes guide matters: on a DDP shipment these charges are normally inside the quoted service, but what each quote includes differs. Before booking, ask two questions in writing — who pays an exam if one occurs, and how many free days you have before storage and detention start.

If Your Container Is Selected

• The exam type sets the clock. A document question is measured in hours or days; a scan or tailgate exam in days; an intensive exam at a CES in days to weeks depending on the port and the queue.
• Most of the cost arrives after the exam. Transfer, storage and slow container turnaround charge once free time is used up — which is why the free-time terms in your quote matter as much as the exam fee itself.
• Speed depends on how fast the questions get answered. When the invoice, packing list and classification reasoning can be produced the same day, holds close faster than when questions travel back and forth.
• Attention is what stops it growing. Storage and detention accumulate quietly; a container nobody is watching costs more than the exam that triggered it.

Questions Worth Putting to Whoever Handles Your Freight

The difference between a hold that costs a day and one that costs a month usually shows up in answers given before the shipment ever books:

1. If this container is pulled for exam, who pays — the exam fee, the CES transfer, storage and detention — and what does the quoted scope say about it?
2. How many free days apply, and who is tracking them?
3. How is ISF filed, and how is the 24-hour deadline protected when vessel schedules move? What an entry involves is set out in our guide to US customs clearance, and DDP explained covers how responsibility splits when another party files on your behalf.
4. Who holds the classification reasoning, and how quickly can it be produced if CBP asks?
5. If a container is held, how and when will you tell me? For importers moving toward full containers, the trade-offs in full-container shipping from China to the USA are worth reading before volumes are fixed.

Frequently Asked Questions

Can I avoid customs exams by using a more expensive freight service?

No. Service level does not determine selection. What affects the odds is the accuracy and consistency of your filings, classification, valuation and documentation — plus factors such as a clean import history.

What percentage of containers gets examined?

CBP does not publish a simple reliable rate. Industry estimates put physical exams in the low single digits in ordinary periods, with higher selection during intense trade-remedy or forced-labour enforcement. Treat published percentages as estimates.

How long does a customs exam delay my shipment?

A non-intrusive scan can be a day or less; a tailgate exam is often a few days; an intensive exam at a CES can run from several days to weeks depending on the port and the queue. Document-based holds depend mostly on how fast you answer.

Who pays for the exam?

Exam, CES, trucking and storage charges fall on the importer’s side of the transaction unless your contract says otherwise. On DDP shipments they are usually inside the quoted scope — confirm that in writing before booking.

Does a prior exam make future exams more likely?

Being selected once does not by itself mark you. What does carry forward is inconsistency: a disputed value, a changed classification without explanation, or repeated document mismatches.