The phenomenon is not new. In older detention centers, inmates used toilets and sewer pipes to communicate with each other. But the newly built detention centers are modular buildings where you only have to raise your voice to be heard through the walls.
"It is a significant problem and a challenge for us," says Adrian Russo, head of correctional services at Hinseberg detention center a few kilometers outside Örebro.
Similar detention centers have been built in Nyköping, Ystad and Gothenburg, among others.
In the last five years, nearly 6,000 reports have been made about unauthorized communication.
