our guest is sarah stillman, staff writer for the new yorker magazine.as just announced shias won a george polk award for this article called "the throwaways," and eight-month investigation into law enforcement's unregulated use of young confidential informants in drug cases. it has led to calls for reform in four states. sarah stillman, how did you discover this story? >> i came upon this issue a number of years ago. i have been looking into a case of murder in florida and when i found this young woman's family who have been killed, she told me that -- they told me she had been working as an informant for the police and getting threats on her life and ultimately, she wound up dead in the late with no accountability. i began looking at this issue of what protections exist for informants and found out about rachel's case and rachel's law. i started finding other cases in other states with all kinds of people of varying levels of education and geographies who had their lives put at risk in this way. >> we're also joined by alexandra natapoff, a professor o