Study Finds 1,800 Invisible Lead Fragments in a Single Deer Rib

Written by Justin Park| 12/05/2025

Lead from ammunition in game meat is a long-known red flag. A new study from the University of Saskatchewan goes deep on the topic, and it reveals a scary “microscopic” angle that is literally invisible to hunters and anyone who processes game.

Tiny lead fragments from hunters’ shots can embed in the wild game, the study cites. That suggests that even careful dressing of game meat can’t protect hunters from lead exposure.

The peer-reviewed study was published in Scientific Reports. It was published in October and is titled “Lead micro- and nanoparticles directly observed within gunshot wounds in hunted game meat.”

The study details how advanced imaging methods uncovered thousands of invisible lead particles in field-shot game animals. Notably, the researchers used whitetail deer and sharp-tailed grouse harvested under real hunting conditions.

Conventional medical X-rays detected only large, visible metal fragments, the type hunters might be able to cut around when butchering. When the same samples were examined using the study’s more advanced imaging, the picture changed dramatically.

In a single deer rib section, researchers identified more than 1,800 separate lead fragments not visible to the human eye.

While some wild game donation programs screen meat for lead with X-rays, the study showed even these medical radiographs can miss potentially harmful levels of lead in venison and upland birds. Hunters without any special technology have no way to detect, let alone remove lead they can’t see.

The Dangers of Lead

Most people understand by now that lead is toxic to humans and animals. The United States banned lead from paint in the ‘70s, from water pipes in the ‘80s, and gasoline in the ‘90s. But in most states lead is still legal in ammunition and fishing weights.

Fish and Game officials have long warned against using lead bullets and shells for hunting because they can harm both humans and animals that consume the meat, as well as the target animal if the hit isn’t fatal.

Lead poisoning can have a variety of short- and long-term effects on adults and children, including neurological and reproductive issues. The Centers for Disease Control says, “there are no safe levels of lead in the blood.” Microscopic fragments can pose a real threat to human health if consumed in game meat.

Keeping Lead Off the Menu

The study appears in Scientific Reports, a peer-reviewed, open-access journal published by Nature Portfolio and widely indexed in major research databases. While the journal is reputable and screens papers for methodological rigor, it accepts a high volume of technically sound studies across many fields, which means article quality can vary. 

As with any study published in such a mega-journal, the findings should be evaluated on the strength of the evidence and methods presented.

But for hunters and landowners, the takeaway of this study is straightforward: Lead fragmentation occurs at a scale far smaller than detectable without specialized equipment, and those particles can remain in edible meat. 

The authors call for improved screening methods, more research into health impacts, and consideration of alternative metals for ammunition.

Banning the sale of lead ammunition outright seems like an obvious solution, but concerns about the efficacy and increased cost to hunters have brought opposition from groups such as the NRA and kept lead ammo on the menu in many states. 

Non-toxic shot is required for waterfowl hunting nationwide, but lead is still used for big game and upland bird hunting. 

To help keep lead out of game meat, hunters can choose alternatives such as steel, copper, and bismuth, and private landowners can prohibit the use of lead shot on their property.

With contamination measured in particles too small to see, prevention starts before the trigger is ever pulled. In the end, the only guaranteed way to avoid hidden lead may be to not fire it at all.

AUTHOR BIO: Justin Park is a Colorado-based writer, editor, and avid hunter with a passion for the outdoors. He contributes to leading publications such as GearJunkie, Popular Mechanics, Powder, and Men's Journal, and serves as Editor of Wild Snow. Park is deeply involved in conservation and recreation advocacy, serving as Chapter Chair of the Rocky Mountain Elk Foundation (RMEF) in Summit County. He also represents RMEF on a state recreation committee focused on proactively addressing land use conflicts.