But now, four police officers are among 18 people now in custody for what's become known as the Heaven case, named for the after-hours bar in an upscale part of the city where 12 young people were kidnapped in broad daylight May 26.
Their bodies were found three months later in a mass grave on a ranch.
"What the Heaven case proves with total clarity is that police can pass the controls and polygraphs as if they were candy," said Gustavo Fondevila, a public security expert. "They have absolutely no problem and continue to work for organized crime."
-- Bill Miller