US-Peru inquiry begins this week into downing of missionary plane as drug interdiction flights halted. Behind Peru's tragic shootdown of an American missionary plane is an aggressive drug-interdiction program that has earned Peru nothing but praise from the United States - until now. The Peruvian Air Force's attack Friday on a Cessna aircraft is revealing to Americans the extreme measures foreign governments sometimes take in the US-promoted drug war - measures that in some cases would not be tolerated at home. The shootdown killed an American missionary and her infant daughter. [continues 919 words]