3M Dust Mask Lawsuit: Verdicts, Deadlines, and RICO Countersuit

The 3M dust mask lawsuits are product liability claims brought largely by Appalachian coal miners who say 3M’s disposable respirators failed to protect them from coal and silica dust, causing black lung disease. A Kentucky jury delivered a $67.5 million verdict against 3M in 2018, roughly 6,000 claims remain pending in Kentucky as of mid-2026, and the litigation has since spawned a federal racketeering suit by 3M against three plaintiffs’ attorneys and a separate consumer protection action by West Virginia’s attorney general.

What Miners Are Alleging

The claims focus on three 3M respirator models sold to miners over several decades:

The 8710, a cup-shaped disposable mask made from 1972 to 1985.
The 8210, a later cup-shaped, valveless disposable marketed for coal and mining use.
The 8500, manufactured from 1962 to 2003 and named in earlier asbestos-related claims.¹

Plaintiffs say the masks collapsed and leaked in the heat and humidity of underground mines. The valveless designs trapped exhaled breath, and moisture built up inside, causing the mask material to flex and lose its seal against the face. The result, according to the suits, was a “dangerous illusion of safety”: miners believed they were protected while harmful particles slipped through gaps between the mask and skin.²

Plaintiffs point to internal 3M documentation from 1977 acknowledging that the 8710 was “unacceptable in the underground mining area due to collapse and abuse from high heat and humidity.”² They also cite correspondence showing that NIOSH alerted 3M as early as 1975 that its masks did not provide sufficient protection,³ and that in 1980 NIOSH warned the company the 8710 “had the propensity to leak and should not be used to protect users against asbestos.”⁴

Legal theories include strict product liability for defective design, negligence, and failure to warn. Plaintiffs have also alleged that 3M manipulated NIOSH approval testing for the 8710 with “minimal and misleading supporting documentation to make the mask seem more effective.”⁴

3M denies the allegations. The company argues that its respirators are effective when properly selected and used, and that the resurgence of black lung stems from multiple factors, including longer mining shifts, increased silica exposure from cutting narrow rock seams, and inadequate general dust controls within mines.⁵

The Verdicts So Far

3M’s trial record in these cases has been mostly favorable. By late 2021, the company reported that it had prevailed in 15 of 16 dust mask trials.⁵

The one loss was substantial. In April 2018, a Knott County, Kentucky jury awarded $67.5 million to brothers Leslie and Michael Cox, both former coal miners diagnosed with black lung, emphysema, and decreased lung function after years of using the 3M 8710 respirator.⁶ After a three-week trial, the jury found the mask was in a “defective and unreasonably dangerous condition” and that 3M had acted with “reckless disregard” for miner safety.⁷

Of the $67.5 million total, $62.5 million was punitive damages. The jury reduced compensatory damages by 60 percent for Leslie Cox and 70 percent for Michael Cox to account for their smoking histories, but 3M remained liable for the full punitive award.⁷ The jury assigned no liability to the coal companies that had employed the brothers.⁶ 3M announced it would appeal.

Filing Deadlines Have Become the Main Battleground

Kentucky law gives a miner one year from the date they knew or should have known that a dust mask could be blamed for their lung disease. That rule has become 3M’s most effective defense. The company argues in case after case that miners who applied for federal black lung benefits, Social Security disability, or workers’ compensation years earlier had already connected their masks to their illness, starting the one-year clock long before they filed suit.⁸

That defense led 3M to scrutinize the sworn statements plaintiffs’ attorneys filed to defeat timeliness challenges. In 2023, Pike County Judge Howard Keith Hall ruled that an affidavit filed by attorney Glenn Hammond in the case of plaintiff Johnny Wilson was “materially false.” The affidavit had been used to argue Wilson did not know he could sue until shortly before his March 2020 filing, but 3M produced a January 2019 letter from Hammond to a doctor requesting medical records for an “injury claim,” showing the legal pursuit had begun well before the one-year window would have permitted. The Kentucky Court of Appeals affirmed that ruling in early 2026.⁸

3M’s Racketeering Suit Against Plaintiffs’ Attorneys

In June 2025, 3M went on offense. The company filed a federal Racketeer Influenced and Corrupt Organizations Act suit against three plaintiffs’ attorneys: Glenn Hammond, Mike Martin, and Johnny Givens. 3M alleges the three conspired to file more than 850 meritless black lung claims over an 18-month period to overwhelm the company and force settlements.⁹

Among the evidence: a 2023 text message Martin accidentally sent to a 3M lawyer complaining that Hammond was “hurting our clients with real claims because so many are frivolous.” Martin later filed an appearance in one of the cases he had criticized.⁹ 3M also alleges Hammond moved original case files, including intake forms and medical records, to a secret storage unit to hide them from discovery, and that he coerced employees into signing false statements. A federal court has ordered preservation of the storage unit’s contents.¹⁰

The fallout has spread across the underlying miner cases. After the false-affidavit findings, Martin and Givens moved to stay hundreds of pending Kentucky cases involving Hammond and questioned his handling of client files. They also voluntarily dismissed more than 40 claims in early 2023, admitting that none of those 44 claimants had been diagnosed with black lung at the time of filing.⁹ The three attorneys are awaiting a ruling on their motions to dismiss the RICO case.

West Virginia’s Consumer Protection Suit

On a separate track, West Virginia Attorney General J.B. McCuskey filed suit against 3M on December 22, 2025. The complaint, originally filed in Kanawha Circuit Court and removed to the U.S. District Court in Charleston the next day, alleges violations of the state’s Consumer Credit and Protection Act and focuses on the marketing of the 8210 respirator to coal miners.²

The state’s theory differs from the miners’ individual product liability claims. Rather than seeking damages for specific injuries, the attorney general accuses 3M of deceptive marketing, alleging the company “misrepresented, suppressed, omitted and otherwise caused confusion and misunderstanding regarding the unsuitability of the 8210 for coal mining.” The complaint notes that the 8210 shares the same collapse and fit defects previously documented in the 8710.² The state seeks a temporary injunction barring 3M from advertising and selling the 8210 in West Virginia, along with civil penalties for what it calls “repeated and willful” violations of the consumer protection act. The case remains pending in federal court in Charleston.

Where Things Stand

Roughly 6,000 claims by Kentucky miners against 3M remain pending as of mid-2026.⁸ Much of the immediate activity has shifted away from trials on the merits and toward two threshold questions: whether individual claims were filed within Kentucky’s one-year window, and whether the RICO case against Hammond, Martin, and Givens will move forward. The West Virginia attorney general’s suit opens a third front, aimed at 3M’s marketing rather than personal injuries. 3M continues to deny all allegations and maintains that its respirators perform as intended when used correctly.

1
Mesothelioma.com. Minnesota Mining and Manufacturing (3M)
2
CoalZoom. West Virginia AG Files New Lawsuit Against 3M Concerning Coal Mine Dust Masks
3
Courtroom View Network. Coal Miner Taking 3M to Trial Over Allegedly Defective Dust Mask
4
Washington State Courts. 3M Dust Mask Appellate Opinion
5
Spectrum News 1. Lawsuits Filed Against Mask Manufacturers
6
Twin Cities Pioneer Press. Miners Awarded $67.5 Million in 3M Dust Mask Black Lung Lawsuit
7
Friedman Rubin. Friedman Rubin Wins $67.5 Million for Coal Miners Injured by Defective Respirators
8
Legal Newsline. 3M Puts Black Lung Lawyers Under Microscope, Finds False Testimony
9
Legal Newsline. Black Lung Lawyer’s Text Mishap Part of 3M’s Racketeering Lawsuit
10
Law.com. A Secret Storage Unit Unleashes New Accusations in 3M’s Black Lung Lawsuit