Dutch police had an easy time identifying an illegal cannabis grow house this week - it was the only building without snow on the roof.
The Telegraph reports that during a house raid last week in Haarlem, police found a large number of cannabis plants and the heat lamps required to grow them.
The heat from the operation had melted snow from the roof, leaving it very conspicuous in the snow-dusted city.
Personal possession and consumption of cannabis is legal in the Netherlands, but industrial-scale growing operations remain illegal.
Two other operations have been uncovered in the past month in the cities of Arnhem and Zutphen using the same technique.
Kijk eens in uw wijk naar de daken. Geen sneeuw? Mogelijke #hennepkwekerij. Bel 0900-8844 of anoniem 0800-7000. ^ps pic.twitter.com/X0zFZWEnNp
— Politie Delft (@PolDelft) February 5, 2015
