Articles Tagged with The Science

Police and prosecutors in North Carolina regularly use breath or blood test results taken after someone has been driving to prove impairment. Questions can arise about the accuracy of the reported BAC if testing was delayed. Retrograde extrapolation attempts to estimate prior blood alcohol concentration by “back tracking,” using a combination of math and science.

Retrograde extrapolation rests on understanding the processes of how alcohol is absorbed and later eliminated by the human body – Bill Powers, DUI Defense Attorney in North Carolina 

This post breaks down the basic science behind these calculations, examines how they work, and looks at what makes them both potentially reliable and questionable in different situations.