operation. if we can hurt refine these efforts in the future we will look to back page and other forums where pimps and exploiters gather and try to penetrate those so that our success rate doubles again. >> reporter: police on the ground help on this. they know what is going on in the communities. they know when there is a child out there walking the streets and which alleged pimps seem to be moving prostitutes from city to city and state to state. >> this took place across the country. >> it is incredible. 76 cities across the country. san francisco seemed of the one of the biggest problems with this. milwaukee, detroit, oklahoma city and smaller cities like jackson, mississippi, who knew there was such a problem there. >> joe, appreciate the reporting. i want to bring in john walsh, child safety advocate and former host of america's most wanted.