With the object of describing the long-term therapeutic needs and possibilities for persons in detention all of the persons placed in detention in Slagelse og Korsør during a period of six months were offered transport to a clinic for the treatment of alcoholism or a psychiatric department after release with the object of reestablishing an individual therapeutic course. Two out of the 105 persons placed in detention who were offered follow-up treatment were interested in the offer. No therapeutic projects were initiated. The police collected some social information about the persons in detention. This information confirmed that the persons placed in detention were mainly young single men and that 47% of these had previously been in detention. As it did not prove possible to illustrate the therapeutic needs and possibilities for persons in detention adequately, the investigation will be continued with an altered design, see the following article.