Dyed Cigar, how to tell?

[kenstogie]

I know that if you have the red/brown fingers it's supposed to be the tell-tale sign of a dyed cigar, is that all there is too it?

Is there a definitive way to tell for sure?

I have had some higher end cigars that do this to some extent and I wonder are they dyed? Could this just be some spit mixing with the maduro wrapper?