Ed. Note: Chris Halkides has been kind enough to try to make us lawyers smarter by dumbing down science enough that we have a small chance of understanding how it’s being used to wrongfully convict and, in some cases, execute defendants. Chris graduated from the University of Wisconsin-Madison with a Ph.D. in biochemistry, and teaches biochemistry, organic chemistry, and forensic chemistry at the University of North Carolina, Wilmington.
Not all DNA evidence is of equal weight; the presence or absence of a body fluid for which forensic tests are commonly available (blood, semen, and saliva) is a critical factor. We will examine two kinds of misunderstandings which have appeared. Continue reading


