U.S. Secret Service agents will be getting ethics training from professors at Johns Hopkins University following a prostitution scandal in Colombia.

About 100 agents will take part in two days of training this week in Laurel, Md., outside Washington. The Secret Service had previously scheduled training for 20 agents. It expanded the program after allegations that 12 of its agents hired prostitutes in Cartagena days before President Barack Obama arrived in the country for a summit.

Officials say the university was an obvious choice for the effort because of its past work with the Secret Service.

The Secret Service has also announced new conduct rules for its agents, including prohibiting them from drinking excessively or bringing foreigners to their hotel rooms.