evidence: Northern Ireland, which remains part of the UK customs territory, is subject to a set of EU rules relating to the single market for goods and the customs union. However, the protocol poses a practical problem: It introduces a system of checks and controls at points of entry for goods arriving in Northern Ireland from the rest of the UK or any other third country. These goods are subject to EU customs duties unless there is no risk of them entering the EU. [...] The retention of certain European laws and the jurisdiction of the European Court of Justice in Northern Ireland was one of the main sticking points of the protocol for the unionists. The Windsor Framework provides for the creation of a "brake" available to the Northern Ireland Assembly. If 30 MPs from different parties object to the implementation of a new European law on goods in the province, they will be able to call a vote to block it, modeled on a provision that already exists in the 1998 peace agreement. However, this emergency mechanism will not take away the European Court of Justice's final say on the rules governing the single market still in force in the province, insisted European Commission President Ursula von der Leyen. In the end, "less than 3%" of European laws will continue to apply in Northern Ireland, London argued.