Observe · Regulate · Protect — since 2007. 19th OIMAP General Assembly: Singapore, 10–12 June 2026. Programme
Protection

Seizure procedure

Securing, handling, documenting, keeping and passing on: the steps of a seizure of cultural property that complies with the law and protects the object.

Updated : October 28, 2026· 3 min read

A seizure that holds up

Ships near the Trieux River, Paul Signac (1925)
Ships near the Trieux River, Paul Signac (1925)

A well-conducted seizure protects both the object and the procedure. It must respect national law, protect the object from any deterioration, document every action and allow later identification and restitution.

The procedure described here is a common framework. It does not replace national law, which specifies seizure powers, formalities and remedies.

It presents the steps, the precautions and the mistakes to avoid.

  • Seizure
  • Procedure
  • Conservation

Seizure procedure in figures

6Steps of the procedure
48 hRecommended time to inform the BIOP
24 h / 24Emergency line
2,300Authorised officers

Source: OIMAP Heritage Protection Department.

Breakdown

Securing18%
Documentation28%
Handling and packing22%
Conservation16%
Transmission16%

Weight of the steps in the time taken by the procedure.

Secure and document

From the moment of discovery, secure the premises, limit access and identify everyone present. Photograph and film the whole scene before any handling: position of the objects, packaging, associated documents. Everything is noted in a timestamped report.

Each object is numbered and has a description sheet. Documents found — invoices, certificates, correspondence — are seized with the objects, because they prove provenance or its absence.

The Calumny of Apelles, Giorgio Ghisi (1560)
The Calumny of Apelles, Giorgio Ghisi (1560)
Seal Color Box (1662–1722)
Seal Color Box (1662–1722)
The Judgment of Solomon and Esther before Ahasuerus (pair), Dirk Vellert (c. 1530)
The Judgment of Solomon and Esther before Ahasuerus (pair), Dirk Vellert (c. 1530)

Handling and packing

Objects are handled with cotton or nitrile gloves, with both hands, as close to their centre of gravity as possible. An object is never cleaned, neither earth nor concretions are removed, and no attempt is made to glue fragments back together. Fragile objects are placed in boxes with tissue paper or neutral foam.

Heavy objects are moved with suitable means. Paintings are carried upright, face against a support, sculptures by their base. In case of doubt, the emergency line guides the team live.

Keeping and passing on

Seized objects must be kept in a safe place, at stable temperature and humidity, away from light, with controlled access. A conservation register records every movement. For high-value pieces, a partner museum may be asked.

The BIOP unit is informed within forty-eight hours. It compares, verifies, identifies possible owners and puts the officers in touch with foreign investigators. Legal follow-up and restitution then proceed according to the applicable procedure.

Respect rights

A seizure must respect people's rights: information on the reason, presence of a representative if the law requires, possibility of challenging. Good-faith holders are treated with respect and informed of their remedies, notably the possibility of fair compensation.

Respecting these rules protects the investigation and preserves the market's confidence in the procedure. OIMAP recommends consulting a specialised magistrate in a complex situation.

The six steps

Six steps
StepKey actionsDocument
SecuringLimit accessOpening report
DocumentationPhotograph, film, numberDescription sheet
HandlingGloves, packing, transportMovement register
ConservationSafe place, stable conditionsConservation register
InformationAlert the BIOP unitSecure message
Follow-upAppraisal, courts, restitutionInvestigation file

Landmarks

  1. Discovery

    Securing.

  2. Documentation

    Photos, report.

  3. Transfer

    Place of conservation.

  4. BIOP information

    Secure message.

  5. Expertise

    Report.

Never clean

S. Giorgio Maggiore, Michele Marieschi (1741)
S. Giorgio Maggiore, Michele Marieschi (1741)
Sketches in Belgium and Germany, Volume I: Hall of Justice of the Magistrates du Franc, Bruges, Louis Haghe (1840)
Sketches in Belgium and Germany, Volume I: Hall of Justice of the Magistrates du Franc, Bruges, Louis Haghe (1840)
Carnet (1863–1865)
Carnet (1863–1865)

Conservation on site or transfer

The Antechamber of the Palace of Justice, Paris, Charles Meryon (1855)

On site

The service's warehouse
  • Quick
  • Limited control of conditions
  • Risk over a long period

For a few days.

Whitby Harbor, Frank Meadow Sutcliffe (c. 1885)

Transfer

Museum or laboratory
  • Suitable conditions
  • Experts available
  • Requires coordination

For the duration of the investigation.

Carrying out a seizure

  1. Secure

    Protect the premises.

  2. Document

    Photograph everything.

  3. Handle

    Pack with care.

  4. Keep

    Choose a suitable place.

  5. Inform

    Alert the BIOP unit.

Equipment and documents

A prosecutor

Boating in Moonlight (1600s)
« A badly documented seizure is a seizure lost at trial. A good file is photographs, numbers, signatures and common sense. »
Prosecutor Édouard Lacombe, magistrate

Vocabulary of seizure

Report
Instrument recording facts.
Movement register
Log of an object's movements.
Relative humidity
Moisture content of the air.
Chain of custody
Series of persons who have held the object.

Frequently asked questions

Who bears the conservation costs?

According to national law and agreement between States.

Can a seized object be exhibited?

No, during the investigation.

How long can an object be kept?

According to the judicial procedure.

Where can I find templates?

In the useful documents on this page.

Useful documents

Contacts

Roman Ruins, Villa Pamfili, Hubert Robert (1774)
Roman Ruins, Villa Pamfili, Hubert Robert (1774)
Heritage Protection DepartmentParis — Headquarters+33 1 00 00 03 00protection@oimap.exampleMonday to Friday, 9 am – 5 pm

See the contacts

Plaque (1500s–1600s)

Whom to call.

Contacts
Image credits (16)
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