Pubdate: 16 Sept 1998 Source: Chicago Tribune (IL) Contact: http://www.chicago.tribune.com/ Author: New York Times News Service Section: Sec. 1 TOP MEXICAN DRUG UNIT IS TAINTED, U.S. ASSERTS WASHINGTON -- Most of the top investigators of an elite Mexican police unit that was trained by Americans might have ties to drug traffickers, U.S. officials say. The disclosure threatens to undermine an ambitious effort to overhaul the deeply corrupt law-enforcement system of Mexico. U.S. government experts traveled to Mexico late last month to administer routine lie-detector tests to dozens of police agents. Now officials say some investigators who failed had been chosen for their posts after elaborate U.S.-designed screening. U.S. officials said they were just beginning to assess the damage that corrupt investigators might have wrought, a task that could take months. Most senior officials in the unit were implicated by the lie-detector tests. Officials say even now that much of the sensitive information that U.S. law-enforcement agents shared with Mexican counterparts over the past year may have been compromised. "You have to assume that everything we've been giving them has ended up in the hands of the traffickers," said a senior U.S. law-enforcement official. "It's a disaster." Mexican officials are expected to undertake their own inquiry into the case, which involves a force called the Organized Crime Unit that was set up 18 months ago. Some Mexican officials have challenged the lie-detector tests, U.S. officials said. The penetration of the unit, apparently by powerful drug gangs, is the latest in a series of such calamities. Last week The Washington Post reported that Mexican officials planned to press drug-corruption charges against a handful of army soldiers who had been stationed at the Mexico City airport as part of the armed forces' growing role in the anti-narcotics fight. For 10 years, as successive administrations in Washington have sought to work more closely with the Mexican authorities, both to fight the flow of illegal drugs to the United States and to strengthen the rule of law in a strategically vital neighbor, U.S. officials have publicly embraced senior Mexican prosecutors, police commanders and other officials who have later been revealed, one after another, to have taken bribes from major drug smugglers. In the most serious case, the Mexican government announced early last year that its drug-enforcement chief was in fact working secretly with the man then considered the biggest cocaine trafficker in the country, Amado Carrillo Fuentes. Days earlier the official, Gen. Jesus Gutierrez Rebollo, had been basking in the praise of the U.S. anti-drug czar Barry McCaffrey. - --- Checked-by: Patrick Henry