Add Yahoo as a preferred source to see more of our stories on Google. I grew up in rural Colorado, deep in the mountains, and I can still remember the first time I visited Denver in the early 2000s.

Add Yahoo as a preferred source to see more of our stories on Google. Washington -- The Justice Department on Wednesday ordered federal prosecutors to stop pursuing criminal charges and drop all pending cases targeting the sale of illicit "defeat devices" that are used to tamper with air pollution control systems in diesel-powered vehicles, according to a memo seen by CBS News.