WATCH: There have been 3,646 human trafficking cases reported in the United States this year. However, according to Polaris, that estimate could reach into the hundreds of thousands. Polaris is a nonprofit dedicated to combatting human trafficking.
Due to the secretive nature of trafficking, it's difficult to know exactly how many victims there are. This year's Trafficking in Persons Report Ceremony presented by Secretary of State John Kerry estimated there are 21 million worldwide.
The worldwide estimate of the number of victims varies greatly, due to victims being kept quiet through fear of being reported for prostitution, and traffickers targeting poor and marginalized populations who don't have the resources to seek help.
Some estimates are as high as 30 million, according to the CNN Freedom Project.
Sexual exploitation was noted as by far the most commonly identified form of human trafficking (79%) followed by forced labour (18%).
Human trafficking is broken down into two main categories: sexual exploitation, like prostitution, and forced labor.
Traffickers also play into the narrative... threatening to call the police and report them for prostitution if they push back.
According to the U.N. Office on Drug and Crime, only 1 out of 100 victims is ever rescued, a majority forced to remain silent through fear tactics.
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