DNA expert witness Dan E. Krane of Forensic Bioinformatics, Inc. on scientific evidence:
What makes scientific evidence so powerful in court is very simple: it’s supposed to be scientific. That means that it is supposed to be objective and completely independent of the subject of an investigation (a suspect or a defendant). It is therefore absolutely shocking that DNA testing laboratories routinely put themselves in a situation where specific information about a subject’s DNA profile might influence their interpretation of an evidence sample.
Last December, eleven prominent experts from around the US and even Scotland met in Washington, DC to discuss the problem of examiner bias/context effect in DNA profiling. Given the breadth of expertise and roles of these experts it surprised many of us that we were able to not only agree about the magnitude and nature of the problem, but also to a solution. The result was the generation of a position paper that has been published in this month’s Journal of Forensic Sciences.


