Chipotle Mexican Grill Inc.’s Mark Crumpacker, one of the beleaguered company’s top four executives, was placed on administrative leave following reports that he was linked to a cocaine bust in New York. Crumpacker, who was named marketing head in 2009 and more recently took the title chief creative and development officer, was among more than a dozen people facing charges linked to alleged cocaine purchases over the last year, according to the New York Daily News.