Fighting “unique” toolmark testimony with science and an amicus brief

Image result for tool marks

Much like bitemark “identification”

“In this case, a toolmark “expert” testified against James Genrich by assuring the jury that several of Genrich’s tools made purportedly unique marks on fragments of the bombs recovered from the crime scene, “to the exclusion of any other tool” in the world. That testimony all but assured Genrich’s conviction. But as this brief describes, the scientific community has now recognized that it is not a forensic discipline. “The reality is that uniqueness is impossible to prove, and is not anywhere near as relevant as some may claim[.]”2”

Read the entire brief filed in The People of the State of Colorado v. James Genrich

Genrich-appellate-filing

About csidds

Dr. Michael Bowers is a long time forensic consultant in the US and international court systems.
This entry was posted in junk forensic science and tagged , . Bookmark the permalink.

One Response to Fighting “unique” toolmark testimony with science and an amicus brief

  1. John Lentini says:

    We need to always distinguish between the “tool marks” made by tools from the “tool marks” made on projectiles by gun barrels. There are far fewer variables with the gun kind. There are many times when the landmarks and the thousands of striations made by a barrel are, in fact, unique.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s