And even the limited agreement reached with the EU will be ripped up if the UK ever pulls out of the European Convention on Human Rights (ECHR), the full document reveals.
But he warned: “Cooperation will be still be slower/more clunky than now” – raising the alarm over the loss of real-time access to the European Criminal Records Information System (ECRIS).
Similarly, the UK will be shut out of the SIS II database, which raises alerts over suspected terrorists and organised criminals, having to rely on slower information-sharing after requests.
The UK will also lose the ability to initiate joint investigations through Europol and Eurojust – regressing to “a more arms-length role in these two bodies where UK has been a leader”, Lord Ricketts said.
And, with the loss of the European Arrest Warrant, EU states will no longer have to extradite their nationals to the UK, although they will be obliged to investigate suspects domestically.
Lord Ricketts, who chairs the Lord committee which has been investigating the loss of capability, said: “It all depends on the Commission making a positive data adequacy ruling within 4-month window.
“And all this cooperation can be suspended if UK fails to respect fundamental rights as set out in the ECHR.”