Police and forest rangers used first-person-view drones in 2024 to investigate reports of illicit cultivation inside the Bromo Tengger Semeru National Park in East Java.[1][2] From 18 to 21 September 2024, a joint team of the park authority, Lumajang Police, soldiers and Argosari village officials uncovered a cannabis growing site in the Pusung Duwur Block, in the Senduro and Gucialit districts.[2] The team found the plants hidden in dense undergrowth on steep slopes far from hiking routes and tourist spots, mapped the site by drone, then cleared the plants and handed them to police as evidence.[1][2]

Between September and October 2024, police destroyed more than 47,000 marijuana plants on Mount Semeru’s slopes, seized 10 kilograms of dried marijuana and arrested at least four local villagers as suspects.[1] The suspects were undergoing proceedings at the Lumajang District Court when the operation was publicly described in March 2025.[2]

The government statements in March 2025 denied that the plantation had been grown by park staff or that drone and access restrictions were imposed to cover it up.[1][2]