Some things shouldn’t need to be spelled out. But in light of a prostitution scandal in Colombia, the men and women who protect the president are getting a new rulebook. Many of the new regulations are aimed at overseas travel, and include no drinking within 10 hours of time on duty, and no bringing foreigners back to the hotel. And if the cautionary tale of the past weeks has not made the danger of the Service’s “wheels up, rings off” culture clear enough, the agency will also be sitting employees down for ethics sessions. The Secret Service has said the new guidelines are “common-sense enhancements” of what’s already on the books.