Disaster

Calderon's drug war:

Mexico replaced the federal police chiefs from each of the country's 31 states and the Federal District on Monday, pending polygraph and drug tests to determine whether they are on the right side of the law in the nation's foundering drug war.

...

The removed state heads of the federal police, known as the Federal Preventive Police, or PFP, as well as the Federal Investigative Agency, or AFI, will undergo additional training and be subjected to close scrutiny, Garcia Luna said. They will be given polygraph and drug tests, he added, and their financial assets will be examined to see whether they are in line with a public servant's salary.

I think it's a pretty good indication that you're trying to do the impossible when the way you verify loyalty is to make sure that those who are supposed to be loyal are not too wealthy.