Monthly Archives: July 2014

Error and bias in forensic behavioral science

A crisis is brewing in scientific psychology and forensic science. This concerns the overall reliability of all psychological science (more on this later) and the quality of expert evidence and testimony in courts of law, regardless of the expert’s discipline (yes, even including the supposedly hard stuff, like DNA analysis). The consensus: alarmingly poor. This […]

Ipse Dixit, Expert witnesses, & Specialty Guidelines for Forensic Psychology

Ipse Dixit in Latin means, “he himself said it”; It is frequently encountered in expert testimony. Ipse dixit is an unsupported statement that rests solely on the authority of the speaker. I think a better translation is “because I said it…[it is true].” It is a conclusory opinion without support. Gutheil & Bursztjan (2003) articulate […]