“…Overall, short-term outcomes (immediately after the end of the treatment) tend to be positive: Of the 12 studies measuring substance use, 6 show positive effects [11,[28][29][30]33,34,42,44], and 2 show mixed effects [20,43]. All six studies measuring treatment utilisation show positive effects [9,20,28,29,33,34,46], and of the five measuring other outcomes, three show positive results [20,28,29,43], and two show mixed results [42,44]. However, the lasting effects are less convincing: Of the five studies measuring substance use, three show no effect [11,30,43,44] and two mixed results [32,36]; of the three studies measuring treatment utilisation, one shows no effect [32] and two positive results [36,45], and the two studies measuring other outcomes show no effect [43,44].…”