As Immigration and Customs Enforcement escalates its efforts to detain as many people without legal status as possible in California, immigration advocates are reminding people of their constitutional rights. Guest: Nisa Khan, KQED Thousands of migrant families across the country received a text message from Immigration and Customs Enforcement last week asking them to report for what seemed like a routine check-in. But many were detained at these check-ins, including at ICE's field office in downtown Los Angeles. Reporter: Mark Betancourt Learn more about your ad choices. Visit megaphone.fm/adchoices