Reining in surveillance is an uphill battle, no matter where you go in the world. Europe has a plan for regulating AI and biometric mass surveillance, but it’s full of holes and exemptions. North Carolina gave police real time access to people’s cell phone location data without a warrant. So how do you put guardrails surveillance tech that are actually effective? Host Caitlin Thompson talked with Albert Fox Cahn of the Surveillance Technology Oversight Project. He has some ideas.