A 2,800-Year-Old Drug Test: Siberian Nomads' Hair Tests Positive for Cannabis

Long before dispensaries, legalization ballots and late-night snack runs, the people of the Eurasian steppe may already have been getting high. Scientists who ran a drug test on hair recovered from a 2,800-year-old burial mound in Siberia found that it came back positive for cannabis, The New York Times reports. That result is the earliest known evidence of psychoactive cannabis use.

The finding turns a strand of ancient hair into a witness. Most archaeological evidence of drug use is indirect. It usually takes the form of residue scraped from a pipe, a charred seed in a brazier, or a vessel that might have held an intoxicant. Those clues show that a substance was present. They do not show that anyone consumed it. Hair is different. As it grows, it records chemical traces of what a person took in. A positive result therefore points to a body that actually absorbed the drug, not just a ritual object that held it.

The Scythian Connection

The burial is tied to the Scythian world, a loose network of horse-riding nomadic cultures that ranged across the steppe from the Black Sea toward Siberia in the first millennium B.C. The Scythians already had a reputation for this sort of thing. In the fifth century B.C., the Greek historian Herodotus wrote in his Histories that Scythians threw hemp seeds onto red-hot stones inside small felt tents. He said they "howled with joy" in the resulting vapor. Scholars have debated for generations how literally to read that account. Herodotus was a gifted storyteller, and he did not always stop to check a good anecdote.

Physical evidence has slowly backed him up. A 2019 study in Science Advances examined wooden braziers from the Jirzankal Cemetery in the Pamir Mountains of western China, roughly 2,500 years old. The researchers found chemical signatures of cannabis with elevated levels of THC, the plant's main psychoactive compound. That suggested people were burning deliberately potent plants, possibly during funerary rites. The Siberian hair adds a more personal kind of proof and pushes the timeline back by roughly three centuries.

Why It Matters

Cannabis has followed humans for millennia. It was cultivated for fiber, oil and food long before anyone could reliably prove it was used to alter the mind. Separating those uses has been one of archaeology's harder puzzles, because the same plant can make a rope or a reverie. Direct biological evidence like this helps settle the question of whether ancient people sought out its effects. In at least one case, the answer appears to be yes.

The discovery also complicates the image of steppe nomads as purely warrior societies. Burial mounds across the region have produced gold, weapons and sacrificed horses. Evidence of intoxicants suggests a spiritual and social life that may have involved altered states, whether for mourning, healing or communion with the divine.

Questions remain. One positive sample cannot show how common the practice was, whether it was limited to elites or ritual specialists, or exactly how the drug was taken. Researchers will want more samples, more sites and careful comparisons with residue evidence elsewhere.

For now, a lock of hair has done what centuries of debate could not. It has offered the closest thing to a confession from the ancient steppe, delivered across nearly three millennia.