Understanding the nature of footwear impression evidence.
"Footwear impressions represent the ultimate enigma in forensic science. They are among the most prevalent types of evidence to be found at crime scenes, but they are simultaneously the least sought-after clues. Over the years, a number of myths regarding footwear evidence have permeated our lexicon and drained our institutional knowledge of effective processing techniques. Police officers and criminalists alike are disadvantaged by this condition, resulting in valuable evidence going unnoticed.
Footwear impressions can tell us about both the criminal and the crime. We may be able to determine the make and style of shoe, and even the identity of the shoe to the exclusion of all others in the world. We can even use these impressions to rule out certain shoes and narrow the suspect pool.
Equally important is our ability to use footwear to tell us how the criminals moved through the scene. Did they climb through a window or boot open a locked door? Did they walk away from the scene or run? Did they enter a particular room or leave it untouched? All of these questions may be answered—but only if we discover the impressions".
Link:
http://www.evidencemagazine.com/index.php?option=com_content&task=view&id=385&Itemid=26