Which EU mechanism allows member states to temporarily reintroduce border controls within the Schengen Area in response to serious threats to public policy or internal security?
- Schengen Borders Code safeguard clause
- Dublin Regulation
- Frontex emergency protocol
- EU Civil Protection Mechanism
Answer: Schengen Borders Code safeguard clause
Article 25-28 of the Schengen Borders Code permit temporary internal border controls (max 6 months, extendable to 2 years in exceptional circumstances) for threats like terrorism or migration pressures. This balances free movement with security, subject to EU oversight and proportionality principles.