The European “Schools Health Education Unit” survey questioned 15881 teenagers at 334 primary schools and found that 29% of 14 and 15-year old males had tried cannabis in 2001 compared to 19% in 1999. The proportion of 14 and 15-year-old girls who had smoked cannabis had also risen from 18% in 1999 to 25% in 2001. One of the leading causes for this sky-rocketing drug use was that the perception of harmfulness of cannabis (and drugs in general)is decreasing. The implementation of student drug testing in schools can give students a clear signal that illegal drug use is not tolerated in society and a reason to say ‘NO’.