Pretty Maps and Plea Bargains: Cellular Records Analysis in Criminal Defense Cases

Cellphone companies keep records of activity on their networks, including the calls, texts, data, and cell sites used for each call. Was the cellphone associated with the defendant in the area when the crime was committed? Knowing where the defendant was at a particular time is an essential piece of evidence that can paint a picture of innocence. When the prosecution produces a map to tie a cellphone to a location, what should the defense team look for when analyzing the map?