Questions about Forest Floor Substrate

I started using Forest Floor Bedding for a couple of days and after I put it in the terrarium I checked online for the reviews and someone said they found bits of glass in the substrate and I didn't believe them but I have been checking it lately and carefully looking at it and don't seem to see any thing reflecting light back at my eyes. http://www.petco.com/product/6347/Zo...r-Bedding.aspx
This is where I found the review.
Does this substrate seem to be safe? I was using Reptile Carpet and switching between it and some kind of white papery stuff before. :confused::confused: