By 2009 the Sinaloa drug cartel had made Phoenix its gun supermarket and recruited young Americans as its designated shoppers or straw purchasers. Voth and his agents began investigating a group
, some not even old enough to buy beer, whose members were plunking down as much as $20,000 in cash to purchase up to 20 semiautomatics at a time, and then delivering the weapons to others.
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