Science Friday at NPR had an interesting discussion about forensic art today that is worth checking out. Rarely in my practice does the work of forensic artists appear, but it is definitely fascinating to see what these professionals do.  One problem of course is that all human experience at some point or another becomes self-referential.  While I don’t doubt that sketch artists have trained themselves to interfere as little as possible in the sketch, undoubtably there is cross contamination.  Every sketch is the impression of one person attempting to draw what another person has seen only (in some cases) fleetingly.  The ironic thing is that circumstantial evidence, so derided in movies and public media, is often the most powerful evidence available to prove something happened.  That said, the sketches are interesting.