Defenders of deferred prosecutions say that they have been too harshly criticized lately and that they play a crucial role in allowing the government to secure the cooperation of a company while avoiding the time, expense and uncertainty of a trial. The agreements, government officials say, also avoid the type of companywide havoc seen most acutely in the case of Arthur Andersen, the accounting firm that was shuttered in 2002 after being indicted in the Enron scandal. The firm’s collapse threw 28,000 employees out of work.

At a Congressional hearing last month, Mr. Ashcroft defended the agreements, saying that they avoided “destroying entire corporations” through criminal indictments. “Prosecutors understand that a corporate indictment can be a corporate death sentence,” he said. “A deferred prosecution can avoid the catastrophic collateral consequences and costs that are associated with corporate conviction.”

Paul J. McNulty, a former deputy attorney general who put new guidelines in place in 2006 for corporate investigations at the Justice Department, said in an interview, “There’s a fundamental misapprehension with D.P.A.’s to think that they’re a break for the company.”

Image John Ashcroft, left, with Timothy Dickinson, a lawyer who has served as a monitor in deferred prosecution agreements for the Justice Department, at a House hearing last month. Credit... Dennis Cook/Associated Press

With the imposition of fines and an outside monitor, “the reality is that for the government, it gets pretty much everything without the difficulty of going forward with an indictment,” said Mr. McNulty, who is now in private practice. “I think companies are beginning to wonder whether they ought to fight more, because they are pretty burdensome.”

But critics of the agreements question that assertion. Charles Intriago, a former federal prosecutor in Miami who specializes in money-laundering issues, said that huge penalties, like the $65 million fine for American Express Bank International in 2007, were “peanuts” compared with the damage posed by a criminal conviction. The company was accused of failing to enact internal controls to guard against laundering of drug money and other reporting problems.

The agreements were once rare, but their use has skyrocketed in the current administration, with 35 deals last year alone by the Justice Department, lawyers who follow the trend said. Banks, financial service companies and auditors have frequently entered into such agreements, including recent ones involving Merrill Lynch, the Bank of New York, AmSouth Bank, KPMG and others. Beyond financial crimes, deferred agreements have been used in lieu of prosecuting companies  though not individuals  for export control violations, obscenity violations, Medicare and Medicaid fraud, kickbacks and environmental violations.