"I firmly believe it makes it safer. We're a world-renowned city with a large immigrant population. And of that population is a population that is also here undocumented," he said. "From a law enforcement perspective, we want to build trust with that population. And our sanctuary city and other attendant laws have allowed us to do that."
San Francisco Sheriff Ross Mirkarimi has argued he was upholding local law and that detainers are not a legal way to keep someone in custody and have been proven to erode police relations with immigrant communities.