I think the tell is usually that you can see a point where a pitcher's spin rate makes a sudden increase, we could much more easily tell who's using if we stacked up their spin rates over the last few years and looked for a dramatic bump.
Also anyone whose current spin rate would have been considered excellent a few years ago is worth investigating.
I think that as a team built around hitting, the Twins are suffering more from sticky stuff than they may potentially be benefiting from it, but it can't possibly be responsible for all of their woes. It certainly gives me more sympathy for strikeout-prone players like Sano,