DNA evidence of an individual’s match to a crime scene, is often felt to indicate complete certainty of guilt. Theoretically, only one person in each billion has a particular DNA sequence. From this, it is assumed that if a technique matches two DNA sets one on the individual and the other at the crime scene this must prove guilt. However, in each case, like the current arrest of Dennis Earl Bradford for the assault of Jenniffer Schuett, 20 years ago in Dickinson, Texas, this evidience is still only circumstantial. It is important for any investigation and subsequently the jury to consider all reasons why there could be a DNA match other than an assumption guilt.

The importance of probability and statistics in our every day life.