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>> on the night sarah goode was murdered, detectives already knew she had dropped off her friend jason at around 1:00 a.m. and a few minutes later, texted him that she had made it home safely. but it wasn't until they combed through sarah's phone records and checked cell tower data that they started to figure out what happened next. those cell phone records were really telling you a story. >> it's incredibly powerful. if you follow it, it's amazing. you see sarah is home. >> lawrence opisso, an assistant district attorney with the suffolk county d.a.'s office, worked the case. >> and jason tex...

And now back to "dateline." on the night sarah goode was murdered, detectives already knew she had dropped off her friend jason at around 1:00 a.m. and a few minutes later, texted him that she had made it home safely. but it wasn't until they combed through sarah's phone records and checked cell tower data that they started to figure out what happened next. those cellphone records were really telling you a story. >> it's incredibly powerful. if you follow it, it's amazing. you see sarah is home. >> lawrence opisso, an assistant district attorney with the suffolk county d.a.'s office, worked ...

As we covered last week, cellphone tower "dumps" are increasingly being used by law enforcement to track criminals. These...

Murdered, detectives already knew she had dropped off her from jason at around 1:00 a.m. and a few minutes later, texted him that she had made it home safely. but it wasn't until they combed through sarah's phone records and checked cell tower data that they started to figure out what happened next. those cell phone records were really telling you a story. >> it's incredibly powerful. if you follow it, it's amazing. you see sarah is home. >> lawrence opisso, an assistant district attorney with the suffolk county d.a.'s office, worked the case. >> and jason texts her, "are you home? are you hom...