Ramirez. Colombia welcomes U.S. drug czar Gil Kerlikowske this week. Kerlikowske, in his role as director of the White House's Office of National Drug Control Policy, will do a progress evaluation of plan Colombia as part of his trip. Ahead of his visit, Kerlikowske told the Colombian newspaper El Tiempo that he sees a commitment on the part of the government of President Juan Manuel Santos, who took office in August. We 're going to talk about the continuation of the relationship between both countries, not only in terms of reduction but also in terms of prevention and demand, said Kerlikowske. Security experts, including Colombian Aurelio Suarez, say Plan Colombia has improved security, but it has fallen short on its original goal of reducing drug production in the region. In what is known as the balloon effect, increased army attacks against drug traffickers in Colombia has moved coca and poppy crops elsewhere. And the quantity of the drug production from the Andean countries like Bolivia, Peru and Colombia is the same as 10 years ago, says Suarez. Salud Hernandez, a journalist who has traveled extensively in areas where coca is grown, has witnessed the balloon effect. She says drug traffickers just move to other countries, but also relocate within Colombia. There are still drug dealers -LSB- in Colombia -RSB-. There's still a lot of drug trafficking, and there are still