UK study has found GM genes in human gut bacteria

The stools tested from the volunteers...showed that a "relatively large portion of the genetically modified DNA survived the passage through the small bowel." 

The study went further to see if this genetically modified DNA could be transferred via bacteria in the large intestine. In laboratory simulated gastrointestinal tracts, three of the seven samples revealed bacteria had taken on the herbicide-resistant gene. And this was after only one GM meal.