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?
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. 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.