Of course, as always this is just the tip of the iceberg on fraudulent returns.

FORBES: Guest Post: Choosing Where Taxes Go

He also has cautioned those who believe they have filed fraudulent returns to pay the government what they owe in taxes.

FORBES: The Taxman Sueth

For example, in Greeley, Colorado this year, district attorney Buck Young raided a tax filing agency to find over 1, 000 fraudulent returns by unlawful workers.

FORBES: Guest Post: Choosing Where Taxes Go

In one survey, more than half of respondents asserted that the IRS was solely accountable for ensuring that fraudulent returns could not be successfully filed.

ENGADGET: Editorial: Countering ID theft requires better awareness campaigns

And Kelvin Crucey, who owned a tax-preparation business in New York, in February of 2011 was sentenced to 27 months in prison for preparing fraudulent returns based on stolen Puerto Rican identities.

WSJ: Billions Lost in Tax-Refund Scam

In September, five men were sentenced to between 40 and 98 months in prison for cashing checks tied to fraudulent Puerto Rican tax returns.

WSJ: Billions Lost in Tax-Refund Scam

In my opinion, the spectacular returns many funds quote are fraudulent-if not outright, then by omission.

FORBES: Pensions Funds: Funding Unsavory Practices of Venture Capitalists (May 1, 2000)