How to help AI find human trafficking victims

For the ongoing series, Code Word, we're exploring if -- and how -- technology can protect individuals against sexual assault and harassment, and how it can help and support survivors. You walk through the door and set your bags on the floor. You pose for a selfie with your hotel room in the background, uploading it to Instagram with seemingly random hashtags. For your followers, the photo is a means of documenting your travels. For investigators, you've just taken a crime scene photo that might one day help them to track down victims of human trafficking.