Half of Mexico's police force should find new jobs.

Mexico: One of the reasons why fighting the drug lords and trying to stop kidnapping in Mexico is going to tough if not unwinnable. Also another reason America needs better border security.

Mexican President Felipe Calderon, fighting a war with violent drug cartels, has said that half of the police recently tested are unqualified to do their jobs. Calderon, in a written response to questions from legislators, said 49 per cent of 56,000 local, state and federal police evaluated this year scored 'not recommendable'. Mexico's poorly trained and underpaid police are widely viewed as incompetent, and rampant corruption has hampered Calderon's campaign against wealthy drug smuggling gangs. The former head of Mexico's special organised crime unit was arrested last week for selling secrets to the Sinaloa drug cartel for $450,000. Other senior officers have also been caught up in a recent sweep aimed at cleansing Mexico's security forces of informants working for organised crime. Calderon's war on drugs had fanned an escalation of violence that has killed more than 4,300 people this year as cartels lash back at the army and each other. In a human rights report to the United Nations the Mexican army said it will eventually leave the fight against drug trafficking. But officials did not set a firm date for the start of the withdrawal. The country's leaders have argued they must use soldiers in a nationwide crackdown on the drug trade because police are still too corrupt to take over the battle. Many have criticized President Felipe Calderon for deploying more than 20,000 soldiers across Mexico. The National Human Rights Commission says some of them have tortured, raped and even killed civilians.