The Additional Child Tax Credit, a tax credit that was intended to help working families with  children living at home, is being used by undocumented workers to the tune of&nbsp; $4.2 billion a year.&nbsp; Not only are they claiming children in the United States, but also children that are still residing in Mexico.&nbsp; Although the IRS has known about this problem for years, nothing has been done.&nbsp; How does this happen?&nbsp; Read more:  <a href="http://dailycaller.com/2012/04/30/irs-loophole-for-illegals-children-costs-taxpayers-billions/#ixzz1tiR1RbxL" style="color: #003399;">http://dailycaller.com/2012/04/30/irs-loophole-for-illegals-children-costs-taxpayers-billions/#ixzz1tiR1RbxL</a>.<br />