Xavier Collin/Image Press Agency/MEGA Machine Gun Kelly is opening up about a travel headache that’s still following him years later. The 36-year-old artist revealed he’s unable to use TSA PreCheck or any expedited airport programs, and the reason goes back to a past drug charge. Machine Gun Kelly Reveals Drug Charge Left Him Without TSA PreCheck For Years Eric Kowalsky / MEGA Speaking on the “Take Flight” podcast, MGK, whose real name is Colson…