SAVANNAH GUTHRIE MOM MISSING: DAY 40

Today we learn the FBI has returned to a Mexican restaurant favored by the Guthrie family, to re-interrogate restaurant employees. This,  as the possibility of retinal scanning of the images of "porch guy." We also talk to a tattoo expert about whether a quick tattoo removal is possibly.  Joining Nancy Grace today:  Kristian Hammond  - Artificial Intelligence Expert and Professor of Computer Science at Northwestern University, Director of The Center for Advancing Safety of Machine Intelligence (CASMI), website: https://casmi.northwestern.edu/   Jeff Garnett - Co-Founder, Inkless Tattoo Removal Centers, website: InklessTattooRemoval.com, Instagram: @inkless.laser,  Brian Fitzgibbons - Director of Operations for USPA Nationwide Security, leads a team of investigators specializing in locating missing persons, website: www.uspasecurity.com, Instagram: @uspa_nationwide_security, former Marine and Iraq war veteran  Joseph Scott Morgan  - Professor of Forensics: Jacksonville State University, Author, "Blood Beneath My Feet", Host: "Body Bags with Joseph Scott Morgan", Instagram @JoScottForensic Dave Mack - Crime Stories Investigative Reporter  See omnystudio.com/listener for privacy information.