Short answer
A Member State cannot ordinarily replace an EU authorisation with its own risk judgment or impose a unilateral ban merely by invoking public health, the environment or the precautionary principle. It needs a power preserved by the applicable EU regime and must satisfy that power's evidence, urgency, notification, procedure, proportionality and time-limit requirements.
The route depends on the product. General food law permits interim measures after the State has asked the Commission to act and it has not acted. GM food and feed require an evident likelihood of serious risk. Member States may separately opt out of cultivation on defined non-risk grounds. EU approval of a pesticide active substance is not EU-wide product authorisation: formulated products are normally authorised nationally. REACH permits urgent provisional measures, subject to rapid Commission review.
In every sector, the national authority should identify the exact product, authorisation, use and legal route. A restriction based only on political concern, old evidence, a hypothetical risk or a general appeal to precaution is unlikely to survive review.
EU authorisation changes the starting point
Once the EU has assessed and authorised a product or use, a Member State may not normally conduct a parallel exercise and reach the opposite result. It must use the governing review, safeguard, emergency or opt-out mechanism.
Ordinary enforcement remains possible where the item differs from its authorisation or breaches its conditions. That differs from prohibiting the compliant product.
Article 114(4)–(6) TFEU exceptionally permits certain retained rules or new environment or working-environment provisions based on new evidence and a State-specific post-harmonisation problem. Commission approval is required; it cannot evade a specific procedure.
Food emergencies require Commission involvement
Regulation (EC) 178/2002 provides the general food and feed emergency system. Under Article 53, the Commission may act where it is evident that food or feed is likely to constitute a serious risk to human or animal health or the environment and Member State measures cannot contain it satisfactorily. Measures can include suspending marketing, use or imports and imposing special conditions.
A Member State's unilateral power is deliberately interim:
“Where a Member State officially informs the Commission of the need to take emergency measures, and where the Commission has not acted in accordance with Article 53, the Member State may adopt interim protective measures.” —
The State must immediately inform the Commission and other Member States. EU committee review follows, and the measure may remain only until EU measures are adopted. Product-specific legislation may set the substantive trigger while borrowing this procedure.
Food that is unsafe under Article 14 cannot be placed on the market whether or not some ingredient or category has previously been authorised. But an authority must distinguish a concrete non-compliance or unsafe batch from a challenge to the EU authorisation itself.
GM food and feed: a demanding serious-risk test
Article 34 of Regulation (EC) 1829/2003 applies where it is evident that authorised GM food or feed is likely to constitute a serious risk, or where an urgent suspension or modification is needed following an opinion of the European Food Safety Authority. It directs the authorities to Articles 53 and 54 of Regulation 178/2002.
In joined cases Monsanto and Others, C-58/10 to C-68/10, the Court held that a Member State using this route must comply with Article 54's procedure. It also defined the substantive threshold:
The risk “must be established on the basis of new evidence based on reliable scientific data” and cannot rest on “a purely hypothetical approach”. —
The assessment should be as complete as the particular circumstances allow and show a clear, serious risk. In Fidenato, C-111/16, the Court confirmed that the precautionary principle does not dispense with Article 34's conditions. A State may act after formally notifying the Commission and while the Commission has not acted, but cannot lower the statutory threshold simply because scientific debate continues.
GMO cultivation opt-outs are different
Directive 2001/18 ordinarily prohibits Member States from impeding the placing on the market of compliant authorised GMOs, subject to its safeguard clause. Article 23 allows a provisional restriction where new or additional information affecting the environmental risk assessment, or reassessment based on new scientific knowledge, gives detailed grounds for finding a risk to health or the environment. The State must notify the Commission and other States and supply the new information and risk review.
Cultivation has a separate route. Article 26b, inserted by Directive (EU) 2015/412, allows a State first to seek exclusion of some or all of its territory from the geographical scope during authorisation. It may also restrict cultivation after authorisation where the measure is reasoned, proportionate, non-discriminatory and consistent with EU law. Compelling grounds may include environmental policy, planning, land use, socioeconomic effects, avoiding GMO presence in other products, agricultural policy and public policy; public policy cannot stand alone.
Those grounds “shall, in no case, conflict with the environmental risk assessment” carried out under the EU authorisation system. —
The draft and grounds must be sent to the Commission before the standstill. This power concerns cultivation, not blocking authorised GMOs as products.
Joined cases C-364/24 and C-393/24 confirm that cultivation geography remains separate from product authorisation. The Court upheld the transitional mechanism used to exclude MON 810 cultivation from parts of Member States' territory. Where the authorisation holder accepted that transitional exclusion, no one of the later Article 26b(3) grounds was required; national law could impose proportionate penalties for breach. That narrow transitional holding is not a general power to prohibit sale or use.
Pesticides: distinguish the substance from the product
Regulation (EC) 1107/2009 separates EU approval of an active substance from Member State authorisation of a formulated plant-protection product. An approved active substance therefore does not by itself entitle every formulation and use to be marketed throughout the Union.
For a product application, the Member State assesses the formulation, uses, exposure and local agricultural, plant-health and environmental conditions. Under Article 36(3), it may impose suitable risk-mitigation conditions and must refuse authorisation if its specific concerns cannot be controlled. Zonal assessment and mutual-recognition rules still constrain national discretion.
Article 44 requires review and withdrawal or amendment where Article 29's requirements are no longer met, information was false or misleading, conditions were breached, or current knowledge permits changes. The holder must be heard.
For emergencies, Article 69 applies where an approved substance or authorised product is clearly likely to constitute a serious risk that Member State measures cannot contain satisfactorily. The Commission adopts the restriction or prohibition after examining the evidence. If the State formally requests emergency action and the Commission has not acted, Article 71 permits interim national measures, immediate notification and EU review.
In Blaise, C-616/17, the Court confirmed that precaution governs both active-substance approval and product authorisation. It requires a comprehensive assessment based on reliable scientific data, not unstructured national discretion.
REACH chemicals: urgent provisional action
REACH registration is not a finding that a chemical is safe. Authorisation under REACH is use-specific, while Annex XVII restrictions regulate manufacture, marketing or use. Normally, a new broad restriction should proceed through the Union restriction process.
Article 129 nevertheless preserves an emergency safeguard:
Where a Member State has justifiable grounds for believing “urgent action is essential to protect human health or the environment”, it may take appropriate provisional measures even where the substance satisfies REACH. —
The State must immediately give the Commission, the European Chemicals Agency and other Member States its reasons and scientific or technical information. Within 60 days, the Commission must authorise the measure for a defined period or require revocation. If it authorises a restriction on marketing or use, the State must initiate the EU restrictions procedure within three months.
Other chemical products, including biocides, cosmetics and medicinal products, have their own harmonised regimes. REACH Article 129 should not be assumed to replace their product-specific rules.
What a lawful national measure should show
A defensible restriction normally needs:
- the precise EU authorisation, product identity, use and applicable version of the law;
- the specific safeguard, review, emergency, opt-out or Treaty provision relied on;
- new, product-specific and reliable evidence at the threshold required by that provision;
- an explanation of urgency and why existing controls cannot manage the risk;
- a measure no broader or longer than necessary, applied without discrimination;
- timely notice to the Commission, relevant EU agency and other Member States;
- compliance with standstill, committee and Commission-review procedures; and
- reasons, disclosure of decisive evidence and access to judicial review.
Conclusion
EU authorisation does not make national intervention impossible, but it changes both the legal basis and burden of justification. Member States must work through the exact mechanism chosen by EU law. Food, GM products, pesticides and REACH chemicals do not share one uniform test.
Recurring requirements are specificity, reliable evidence, urgency, proportionality and EU supervision. Precaution informs uncertain-risk assessment; it does not erase a serious-risk threshold or permit parallel national re-authorisation.
Sources
This article provides general legal information, not advice for a specific matter. Laws, facts and procedural deadlines may change the result. Follow the linked primary sources and obtain local advice before acting.