You have gotten multiple responses indicating that you need to get it tested. I agree, but for what? The correct answer is to get a complete nutritional analysis done on EVERY BATCH that you get from the plant. Not for anything toxic, but because the variation between batches can be IS wildly variable. In most cases, every batch is going to be nutritious and likely very nutritious. The caution is that the nutritional levels CAN be to much of a good thing. I got an opportunity to talk with my college in extension. In classic government style, he "passed the buck". Actually, he is restricted from giving out advice on that, the same way I have restrictions. BUT, he said to CONSULT A NUTRITIONIST. This is very good advice and will pay off, even with having to pay the nutritionist as the value that you will gain from the spent grain will more than pay for the fees from the nutritionist at the sale barn.