Officer Nate Baer said Hartline had been riding with truck driver DanielMartinez since his trip started in Tennessee after being kicked out of his home.
Authorities soon arrested DanielMartinez, 29, as a suspected accomplice and later revealed that Summers had been spotted in a video recording as he crossed the border into Mexico at Tecate, east of San Diego.
However, he may still have to appease some fans after saying that his failure to land his top five transfer targets before the season - including United's very own Robin van Persie, Chelsea's Eden Hazard, Javi Martinez (Bayern Munich), Lazio's Daniele De Rossi and Daniel Agger of Liverpool - had cost his team its chance of glory this year.