A senior American anti-drug official described the two cases as "the tip of an iceberg."

Mr. Safir was greeted on this trip to Santo Domingo with friendly newspaper headlines and had a luncheon with anti-drug officials.

Today, Walton, at the age of 41, is the nation's top black anti-drug official, and he has worked hard to smooth relations between the District and the Federal drug office.

Switzerland's top anti-drug official, Valentin Roschacher, was expected to arrive in Mexico today to assist Mexican officials with the investigation.

Mr. Massing projects the image of an army general obstructing American anti-drug officials.

Also captive are at least five mid-level United States Government officials, including John Crowe, a senior anti-drug official in Lima.

Donald McIntosh, a 43-year-old British senior United Nations anti-drug official posted in Bangkok.

That has strengthened the view among American and Mexican anti-drug officials that power in the hemispheric drug trade is shifting from Colombia to Mexico.

May 15 - Mexican anti-drug officials Jose Nemesio Lugo and Jorge Altriste.

Perhaps Mr. Madrazo's biggest success has been to convince skeptics, among them many American anti-drug officials, that he is serious about criminal justice reform.