A crowd of adults, led by school curator Bert-Inge-Karlsson, enters a classroom at the Åby school in Klippan, one of the schools in Klippan's high school. It's time for drug testing.

- Students should be unprepared. This reduces the risk of cheating with the urine test, says Bert-Inge Karlsson.

First it will be a conversation with the students about drugs and smoking, then it is time to pee in a mug. The drug tests are voluntary but very few students reject it.

Analyzes of the community's wastewater show a steady decline in drugs such as cannabis, amphetamine and cocaine. The same development has been noted in school - fewer tests show traces of drugs.

Sometimes it's hard to say no

On this day, Governor Anneli Hulthén is visiting the school. As a politician, she was involved in drug issues. If drug testing in schools is the right way to go, she does not want to retell.

"But you have to be careful not to interfere with the students' integrity," she says.

On some programs, such as where driving is part of the teaching, it is difficult to say no. It can jeopardize practice and certain aspects of teaching.

- The school must know that the students are drug-free when they send out to practice, says Bert-Inge Karlsson.

Everyone was drug-free

We talk to one of the newly tested students, Isak Ahlvin. He thinks the tests are good.

"It's easier than you think to get over drugs in the Rock," he says.

How did it go this time?

- All drug-free, states Bert-Inge Karlsson.

Watch the clip when the school does an unannounced drug test on one of the classes.