Bernadette Gatling said she has lost job opportunities because employers viewed her credit report, which included voided debts.

In the netherworld of consumer debt, there are zombies: bills that cannot be killed even by declaring personal bankruptcy.

Tens of thousands of Americans who went through bankruptcy are still haunted by debts long after — sometimes as long as a decade after — federal judges have extinguished the bills in court.

The problem, state and federal officials suspect, is that some of the nation’s biggest banks ignore bankruptcy court discharges, which render the debts void. Paying no heed to the courts, the banks keep the debts alive on credit reports, essentially forcing borrowers to make payments on bills that they do not legally owe.

The practice — a subtle but powerful tactic that effectively holds the credit report hostage until borrowers pay — potentially breathes new life into the pools of bad debt that are bought by financial firms.

Now lawyers with the United States Trustee Program, an arm of the Justice Department, are investigating JPMorgan Chase, Bank of America, Citigroup and Synchrony Financial, formerly known as GE Capital Retail Finance, suspecting the banks of violating federal bankruptcy law by ignoring the discharge injunction, say people briefed on the investigations.

The banks say that they comply with all federal laws in their collection and sale of debt.

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