Question juridique clé
Whether the cantonal court could uphold an indefinite driving licence withdrawal for alcohol/medication dependence without a further expert assessment of polytoxicomaniac use.
Solution extraite
The cantonal court should not itself have diagnosed polytoxicomaniac abuse; given unresolved doubts, it had to obtain an additional medical report before concluding that driving fitness was absent.
Motifs extraits
The existing expert report did not establish chronic mixed abuse of alcohol and benzodiazepines. Without sufficient medical findings, the court lacked the basis to determine a relevant addiction or a continued risk to road safety.