Question juridique clé
Whether Vaud had standing to appeal the surveillance-fee decision.
Solution extraite
Yes. The canton was directly affected in its patrimonial and sovereign interests by a federal invoice linked to criminal investigations on its territory.
Motifs extraits
A canton may rely on Art. 89(1) LTF when it is directly and specially affected, not merely interested in correct application of the law; here the fee burden and its effect on criminal enforcement sufficed.