The beleaguered community organizing group ACORN properly spent all federal dollars it received in the past five years, according to a study by the nonpartisan Congressional Research Service (CRS).

The report, requested by House Judiciary Committee Chairman John Conyers, D-Mich., also found that no voters who were allegedly registered to vote improperly cast any ballots.

The report comes as the federal government and the California law enforcement officials are probing the Association of Community Organizations for Reform Now -- a group that President Obama worked with in the early 1990s.

The CRS said officials have probed ACORN 46 times. 

Rep. Steve King, R-Iowa, has asked Conyers to hold hearings to scrutinize ACORN's activities but Conyers has declined.

ACORN came under fire in September when a series of undercover videos showed a couple posing as a pimp and prostitute receiving advice from ACORN employees on how to evade tax laws. offices. 

The CRS report indicated that the filming may have violated laws in Maryland and California, where some of the taping was done. The CRS study says both states "appear to ban private recording of face to face conversations absent the consent of all the participants."

Congress has voted to strip ACORN of federal funding. But a federal judge ruled this month that the move was unconstitutional -- a decision that the Justice Department is appealing.

The CRS indicated that courts "may have sufficient basis" to rule that unconstitutional. The Constitution bans "bills of attainder," laws that specifically target one group or person.