Cops Say Uber Driver Saved Passenger, 16, from Sex Trafficking
yahoo.com
yahoo.com
Odds are this wasn't the first time the (alleged) pimps used Uber to deliver the girl. If that is the case, there should be a series of drop offs and pick ups at hotels. Cross reference that GPS data with phone records or emails and you could build a compelling - though maybe circumstantial - case. That's what convinces people to flip.
Then the goal can move beyond two pimps and potentially see a larger network.