E/CN.4/2003/85/Add.2 page 3 migrants in the frontier region; training members of the Federal Preventive Police involved in support for the INM in the areas of migration management and human rights; limitation of the intervention of other armed or police forces in migration control activities; and a campaign against extortion and the abuse of undocumented migrants, with effective penalties for officials involved in cases of extortion and physical and sexual aggression against migrants. The Special Rapporteur also considers as crucial action to combat corruption in all its forms, since this is a key element in the battle against the smuggling and trafficking of persons, including, when cases occur, the dismissal and consequent punishment of the officials concerned. The Special Rapporteur takes the opportunity to thank the Mexican Government for the valuable assistance and cooperation she received during her visit to the country, and to thank civil society, migrants and the United Nations for their valuable cooperation during the visit.