Editor's note: This is the fourth installment in a series examining sex trafficking litigation.

Reaching victims of sex trafficking with online advertising can be perilous, because unlike other litigants, they are often still living in highly dangerous situations.

According to legal marketing specialist Susan Knape, that's why the website she runs dedicated to sex trafficking litigation includes a "Quick Exit" link on the side that follows the reader as they scroll down the page. If clicked, the viewer immediately exits the website and the browser opens up to Weather.com.