Unhindered by federal background checks or government oversight, the 24-year-old man accused of killing a dozen people inside a Colorado movie theater was able to build what the police called a 6,000-round arsenal legally and easily over the Internet, exploiting what critics call a virtual absence of any laws regulating ammunition sales.
CORRECTION: A previous headline on this link incorrectly stated that Holmes was able to buy weapons online without a background check.
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