Former U.S. Attorney General John Ashcroft’s law firm could earn $52.2 million helping the U.S. Attorney’s office in New Jersey monitor a leading maker of knee and hip replacements, according to recent public filings.

Ashcroft’s firm is among five legal teams U.S. Attorney Christopher Christie hand-picked to watch the manufacturers, who agreed in September to pay $311 million and hire monitors to settle allegations they paid surgeons to use and promote their devices.