But others disagree.
An activist group, Better Markets, filed a lawsuit in federal court in Washington, D.C. last month challenging a $13 billion civil settlement reached last year between the department and JPMorgan Chase over mortgage-backed securities violations. Among other things, the suit alleges the settlement fails to address individuals' misconduct in the financial crisis.
But Raman said the settlement does not bar the government from prosecuting individuals. And while she would not address the JPMorgan investigation specifically, she said the financial crisis investigations are not necessarily over.
"When you look fairly over the last several years, I think one of the lessons learned is that you can always freeze history in a moment in time and say 'This happened, you haven't charged individuals.' But if you wait and see, there are often enforcement actions taken some months or even some years later."
Battling budget pressures
Raman leaves after a year of intense budget pressures at the Justice Department. Much of her time as acting head of the criminal division was marked by deep cuts under so-called sequestration.
"We can't do our jobs as well or as quickly when we have fewer resources," she said.
Last month, following a Congressional budget deal, Attorney General Eric Holder lifted a three-year hiring freeze, which Raman said will make a big difference. "Our bread and butter is our people."
The White House budget unveiled Tuesday includes $27.4 billion for the Justice Department—a modest increase over last year—including $681 million for financial fraud enforcement.
Raman says the money is critical. "Resources matter for financial fraud enforcement. And hopefully the department will have the support it needs to do that job well," she said.
—By CNBC's Scott Cohn. Follow him on Twitter