(CNN) - A new law will soon require New York City cab drivers to keep an eye out for possible victims of sex trafficking.
The law goes into effect this fall.
Sex trafficking by taxi is rare, but advocacy groups say as police crackdown on brothels, traffickers have adjusted - now paying drivers of all kinds to ferry victims to the customer.
The city plans to train taxi drivers to spot clues.
But some cabbies say they're being unfairly targeted by the law and question how police can enforce it.
Taxi drivers who knowingly transport sex trafficking victims will lose their license and face a $ 10,000 fine.