Snow had settled over the Netherlands, turning streets and homes into a winter landscape. For most villagers, it was a familiar sight. Yet in one small village, a single house caught the attention of many because its roof stayed mysteriously bare, even as the snow covered all the others.
At first it didn’t seem like a big deal. The village residents thought it could be that the house owners were doing some renovations, or maybe they had installed special roofing. Who knew?
However, as days passed by and new snowstorms kept coming, the bare roof became hard to miss.
Well, it turns out that in the Netherlands, there’s a known reason for this oddity and it’s not related to home renovations. So, the villagers alerted the authorities.
The Dutch police knew right away that the “snow-free roof” could indicate a large-scale cannabis cultivation.
Growing cannabis indoors on a commercial scale requires strong lamps, heaters, and ventilation systems. This equipment generates a lot of heat which escapes through the roof and melts snow almost immediately, even in icy conditions.
For the police, the effect works like nature’s own thermal camera.
Officers didn’t have to search long to find the source. Inside the house, there was a fully equipped cannabis farm with plants under strong artificial lighting, heavy humid air, and the distinct smell of marijuana. The heat produced by the hundreds of plants didn’t allow the snow to stuck on the roof, exposing the house’s owner’s “little” secret.
This wasn’t the first time the police to discovered such an operation. In Haarlem, Zutphen, and Arnhem, police used snow-free roofs as a signal to investigate. Their raids uncovered cannabis farms ranging from 88 plants in a converted bedroom to nearly 500 plants worth roughly €50,000.
Following these snow-assisted raids, Dutch police used social media and local news to ask residents to report suspiciously snow-free roofs, which could signal large-scale cannabis farms. As one officer said, “Sometimes, the snow tells you more than the neighbors.”
The reason is simple: cannabis grow rooms produce intense heat from lamps, which rises and melts snow on the roof, even in freezing temperatures. Sometimes only the grow rooms’ areas melt, creating a patchy, almost thermal-map effect.
Foreigners are often surprised to learn that the Netherlands, known for its cannabis-friendly culture, limits marijuana cultivation. Individuals may possess up to five grams and buy small amounts from coffee shops, but growing more than five plants is illegal. Commercial-scale cultivation, such as the farm found in the snow-free house, counts as drug trafficking and carries severe legal consequences, which Dutch authorities enforce rigorously.
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