Oklahoma man made hundreds of ghost guns for Mexican cartel

He did it for years. And only a tip from a legitimate gun parts supplier helped U.S. law enforcement authorities catch him. 

Evidence photos from the U.S. District Court case illustrate the sophisticated operation run out of house in Nuevo Laredo for years, right across the border from Laredo, Texas. 

It's where retired ATF Special Agent Edwin Starr tells CBS News that Andrew Scott Pierson, of Jay, Oklahoma, smuggled ghost gun parts and set up a gun manufacturing operation to supply two different Mexican drug cartels with weapons.