gainingion is not only notoriety. it is being used by law enforcement to track civilians.aryland authorities say that they use facial recognition software to identify the gunman that killed five people at an annapolis newspaper. amazon'scalls recognition software that it claims can five -- find 100 people in a single photo dangerous. revealed this and the orlando pd has stopped using that software. my next guest discussed recognition -- recognition in a blog post for the aclu last month. he joins us now. why is this such a problem, matt? matt: people should be able to walk down the street without being watched by the government. face recognition technology allows the government to track where we are and what we do, whether we go to the church or an abortion clinic. that is not some think they should be able to do. emily: what about the argument this could be a powerful tool for catching criminals or terrorists? there's a lot of unanswered questions about whether this technology works reliably. multiple studies have shown that they are biased against people of color and wom