MEXICO CITY, Nov 23: A top Mexican government official said Thursday that the long-awaited but highly controversial approval of genetically modified (GM) corn fields on a commercial scale will drag into next year. Mariano Ruiz, a deputy agriculture secretary, said in an interview that the regulatory approval process won’t be finalized under the outgoing government of President Felipe Calderon, but instead will fall to his successor to see through sometime next spring. (agencies)