"It will make it harder to protect UK and EU citizens," she said. "We are determined to do everything we can to mitigate that but it will be harder."
Officers said one EU crime-fighting tool, the Schengen Information System database, was accessed by police 539 million times last year.
"Existing EU tools allows us to respond quickly and intelligently to crime and terrorism in the UK and the EU -- they make us better at protecting the public," Thornton said.
Deputy assistant commissioner Richard Martin, the national police lead for Brexit, said if police lost the EU tools they could no longer share real-time alerts for wanted persons, including serious criminals.
British police would also be slower responding to missing people on either side of the Channel.
The ability to track and map terrorist and criminal networks across Europe would also be reduced.
Martin said, "Criminals don't respect borders -- 70 percent of transient organised crime groups operate in more than three countries."
"If we lose all these tools it becomes much more challenging," he said. "Policing does not stop, but it will be slower and less effective."
Chief constable Charlie Hall emphasised that there was no intelligence of widespread disorder but they were planning for every eventuality.
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