regulations amending the prohibition of certain toxic substances regulations 2012 25 pages available in english and french the proposed emregulations amending the prohibition of certain toxic substances regulations 2012 em the proposed amendments would address different issues with respect to canadas management of five toxic substances to reduce harmful releases to the environment. these five substances are 1 hexabromocyclododecane hbcd 2 perfluorooctanoic acid its salts and its precursors pfoa 3 long-chain perfluorocarboxylic acids their salts and their precursors lc-pfcas 4 polybrominated diphenyl ethers pbdes and 5 perfluorooctane sulfonate pfos . classindent-1-0the objectives of the proposed amendments are to ulliprotect the canadian environment and provide regulatory certainty by preventing the manufacture use sale offer for sale or import of hbcd pfoa lc-pfcas pbdes and pfos lilistreamline regulations under cepa 1999 pertaining to the control of toxic substances through the update of existing regulatory controls for pbdes and pfos by adding these two substances to the prohibition regulations 2012 and repealing the regulations under which they are currently managed li ul classindent-1-0the final screening assessments conducted in 2012 by environment canada concluded that hbcd pfoa and lc-pfcas are toxic to the environment under the emcanadian environmental protection act 1999 em cepa 1999 . currently there are no risk management instruments in place respecting preventive or control actions for hbcd in canada. in the case of pfoa and lc-pfcas early risk management actions have been taken. classindent-1-0in addition the proposed amendments provide an opportunity to amend and update existing regulatory controls under cepa1999 pertaining to pbdes and pfos. classindent-1-0the proposed amendments also include administrative changes to the emprohibition of certain toxic substances regulations 2012 em the prohibition regulations 2012 g tbt n can 340.the prohibition regulations 2012 which were developed under cepa 1999 came into force on march 14 2013. they prohibit the manufacture use sale offer for sale or import of specified toxic substances and products that contain these substances with some exemptions.