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As Mexican investigators struggle with the so-far inexplicable death of an 18 year-old woman, the odds of an answer are slim: Even nationally significant homicide cases — like nearly all homicide cases in Mexico — tend to wind up as mysterious as the 1975 disappearance of U.S. union boss Jimmy Hoffa. Poor evidence handling, intentional distortion of investigations, cover-ups, political interests and just plain incompetence often leave the public without complete answers. Surveys by Mexican think tanks say roughly 90% of homicides go unpunished in Mexico.

As Mexican investigators struggle with the so-far inexplicable death of an 18 year-old woman, the odds of an answer are slim: The large majority of homicides in Mexico go unsolved and even nationally notorious cases tend to wind up as mysteries

Many other notorious cases have gone unsolved — at least in the public's mind — for years or even decades:

MEXICO CITY (AP) -- As Mexican investigators struggle with the so-far inexplicable death of an 18 year-old woman, the odds of an answer are slim: Even