The Markup, now a part of CalMatters, uses investigative reporting, data analysis, and software engineering to challenge technology to serve the public good. Sign up for Klaxon, a newsletter that delivers our stories and tools directly to your inbox. Karlena Hamblin was sitting on a stool in her Brownsville, Brooklyn apartment waiting for the Administration for Children’s Services to knock on her door for a weekly check-in. She’d just fed her infant daughter, who she held cradled in her arms. AC...