Investigating Sex Human Trafficking and Knowing the Signs. Many Human Trafficking Investigators interview children that are victim of human trafficking. This is a huge mistake. While many investigators are great at interviewing, they are not certified to interview children and especially when it comes to sex crimes. Investigators should use certified forensic child interviewers. Also, if the case goes to court, the investigator does not have to testify on the forensic interview. The forensic interviewer is certified and an expert at testifying in court. I have seen to many trafficking cases go bad due to an investigator believing they can do everything in a trafficking case. If human trafficking investigators want a slam dunk case, it is very important to use a forensic child interviewer. You do not want to get on the stand and be crushed by defense on the interview you conducted on the child. Defense will throw questions at you with words that you do not know or understand.