 The late 1990s and early 2000s also saw the creation of a number of shelters and rehabilitation programs for prostituted children , and the police began to actively investigate the issue . The National Human Trafficking Resource Center ( NHTRC ) was later established by the Polaris Project as a national , toll @-@ free hotline , available to answer calls from anywhere in the United States , 24 hours a day , seven days a week , every day of the year . Operated by Polaris Project , the hotline was designed to allow callers to report tips and receive information on human trafficking . 
