"Police ask for eyewitnesses who can describe people involved in incidents of interest. They make up composite sketches based on descriptions. "

Yep, and I'm pretty sure my description of "a middle aged brown skinned woman driving a speeding car, 50 feet away" wouldn't be of much use for a police sketch artist.  Your example fails.

You are making a transparently weak argument.  Perhaps it's time for you to reflect on your real motivations.