For a decade, the Justice Department delayed a winning criminal case against Philadelphia-based Endo Health Solutions. That allowed the company to vastly expand its narcotics empire and execute a corporate escape plan.

But a fuller explanation, drawn from corporate filings, interviews, and criminal court and bankruptcy records, shows how the DOJ, after years of aggressively prosecuting opioid companies, delayed for a decade a winning criminal case against Endo. In the intervening years, Endo vastly expanded its narcotic-pill empire before executing a corporate escape plan.

Codenamed Project Zed, the plan allowed Endo to restructure its debt to retain control of the company and hand out $95 million in executive bonuses before seeking protection in bankruptcy. The result for U.S. taxpayers: Endo paid a tiny fraction — three pennies on the dollar — of the $7 billion that officials said it owed the U.S. government, including $4 billion in taxes.