"They had the cops test the substance."
the substance? you mean test the sugar don't you?
Just like the oregano vs pot scam. I've never seen pot, I have no idea if it looks like oregano or not. I've read that it does, but I don't know by my own experience.
Why would they bother to test sugar? It's sugar.
They tested the unknown substance. The results of the tests indicated that the substance was not cocaine.