Damarias Cockerham walked through an unused metal detector in Dallas
                                
                                
                                    (Newser) -
                                    He didn't have a ticket, or even ID, yet a 25-year-old man was able to board a plane in Dallas last July. Authorities say Damarias Cockerham, caught on  surveillance video , walked through a security checkpoint at Dallas-Fort Worth International Airport "without being stopped by a TSA agent" and...