They may not be able to look you in the eye, they may not want to answer questions, and they may become agitated when law enforcement is mentioned. This can often be misidentified as domestic violence or sexual assault and can be difficult to differentiate, but in any case it should be reported. Other factors to consider; if they live with the employer, have precarious living conditions, cannot speak alone with the suspected victim and/or are under 18 years old and engage in prostitution. If you believe you have found someone who is a victim, there are various numbers you can contact, such as 911, or the National Human Trafficking Resource Center