Have you noticed any insects on the plants? Real tiny ones usually under the leaves? Aphids are known to cause a black discoloration on the leaves because of the secretion residue. For the leaves to be affected this bad it would have to have gone untreated for awhile.

Other that that it could be what you are thinking is the cause. I just thought BLS was more of a brown and yellowing spots on the leaves and causes depressions on the leaves.

Do you have any pics of the whole plant not just the one leaf?

you are right it is a leaf spot.

I'm usually pretty good on watching for bugs, had some issues with my tomatoes but hand knocking off the bugs squashed any real damage, havent noticed anything other then some bettles at night on the peppers. I'll snap a shot of the whole plant later today. I did pick up the copper and a small sprayer and will try and hit the plants every 7 days and see how they do.