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The investigation details the way guns move through society, from retail sales to street crimes. The Post set out to break the secrecy imposed by Congress and an examination of how gunes are used in crimes. Their investigation included creating a database of more than 35,000 guns traced to crimes; a comprehensive database of 511 police officers killed by firearms; lists from confidential sources of the top 12 gun dealers who have sold the most weapons trace from Mexican crime scenes over the past two years.