joining us on skype out of new orleans is emily mau, director of the innocence project dedicated to exoneratingrongfully convicted individuals. from atlanta, georgia, jonathan rapping, founder of gideon's promise which provides public defense for low-income citizenship. thanks for being here. one of the issues exposed in our series is how unstable eyewitness testimony can be. why is it unreliable? >> well, i mean there are lots of reasons. there are, i would say, many issues now been identified through the study of the proven wrongful convictions that have been proven through dna evidence. there are numerous methods for law enforcement used that can leave an eyewitness identification to be much less reliable than it could be if better practices were used which i realize is a sort of generality, but there are protocols and procedures like not showing a witness a bunch of suspects all together, which is called simultaneous presentation instead of doing a sequential presentation. there are a lot of things that the research has now shown can really influence a witness. not deliberately but through