Take a look at the Acknowledgement in that report, i.e the flame retardant industry funded it. There are numerous studies into the ill effects of DecaBDE and the fact it's been banned suggest these are well-founded. The flame retardant industry always hides behind their argument that you can't say that cancer was caused by that chemical. Even if that was true, the precautionary principle suggests not using them, especially when there is no evidence they improve fire safety.

"The Illinois Environmental Protection Agency gratefully acknowledges the efforts of the Illinois Public Interest Research Group and the Bromine Science and Environmental Forum to provide the Agency with important information regarding the polybrominated diphenyl ethers, especially decabromodiphenyl ether, in meetings on July 25, 2005 and September 8, 2005, respectively, and through personal contacts. The information provided is greatly appreciated."