More than 400 sex-crimes reported to Maricopa County Sheriff Joe Arpaio's office during a three-year period ending in 2007 - including dozens of alleged child molestations - ... were inadequately investigated and in some instances were not worked at all, according to current and former police officers familiar with the cases. Many of the victims, said a retired El Mirage police official who reviewed the files, were children of illegal immigrants. The botched sex-crimes investigations have served as an embarrassment to a department whose sheriff is the self-described America's Toughest Sheriff" and a national hero to conservatives on the immigration issue. Bill Louis, then-assistant El Mirage police chief who reviewed the files after the sheriff's contract ended, believes the decision to ignore the cases was made deliberately by supervisors in Arpaio's office - and not by individual investigators. "I know the investigators. I just cannot believe they would wholesale discount these cases. No way," Louis said. "The direction had to come (from) up the food chain." Louis said he believes whoever made the decision knew that illegal immigrants - who are often transient and fear the police - were unlikely to complain about the quality of investigations.