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"I'm horrified and ashamed and embarrassed by what I've seen. It's not supposed to be like this," he told 13 Investigates. "We're supposed to protect taxpayers, so somebody had to say something." Howard is a tax examiner at the IRS's ITIN processing center in Austin, Texas. The large, unmarked building in south Austin is where the IRS decides whether to issue an Individual Taxpayer Identification Number to the millions of illegal immigrants who apply for them. An ITIN allows undocumented workers to file tax returns and pay taxes, a legal requirement for those who earn income in the United States … even those who come to the country illegally. But 13 Investigates discovered the ITIN system is plagued by abuse and fraud. A four-month Eyewitness News investigation documented how many illegal immigrants use ITINs to get tax credits and refunds they're not entitled to. WTHR also exposed how millions of undocumented workers get their ITIN applications approved using phony documents. Read More News New Mexico