Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
In a roomful of stuffy diplomats, Stephen Lewis stands out for his powerful rhetoric and punchy humor. More than once, his habit for speaking uncomfortable truths has shamed governments into action.
DNA is often the most incriminating evidence in a courtroom, but sloppy analysis has sent dozens of innocent people to prison. Alisa Opar reports on the efforts to lock down error-free tests.