Part I: THEORETICAL FRAMEWORK

It was Friday afternoon. In a coffee shop just outside the centre of Amsterdam, a middle-aged woman approached the counter.

"Hello Nellie," the assistant behind the counter said; "What can I do for you today." "Hi Frank. I'll have some friends around tonight and would like something not to strong. Some weed maybe? What do you recommend?" Frank fetched a menu from below the counter.

"Well, I think Skunk will be too heavy, but try this African brand. I find it quite pretty because it doesn't knock you out." "Okay," Nellie replied, bought five grams of African marijuana, and added. "On Saturday my boyfriend and I are at home alone. I think we'll have some hashish to relax. Maybe some black from Nepal or some real Red Lebanon if there is any?" She purchased three grams of Lebanon Red. "I have to rush to the butcher now," Nellie said, "Have a nice weekend, Frank. Bye."

In Stockholm, some 1500 kilometres to the north, members of the "Rave Commission" made themselves ready to dash into an apartment where they knew people in Stockholm buy their cannabis. The Rave Commission, originally established by the Stockholm police, monitored rave parties. It comprised young officers out of uniform and specialised in spotting people under the influence of drugs. Eventually their task was extended to disturb the retail trade in cannabis and other drugs in the suburbs of Stockholm. If they found a suspect, a urine test was taken at the station. However, if a blood test was required the suspect was brought to the nearest first aid post.