Health Minister Ujjal Dosanjh says that "Bill C-28 does not change existing government practices" (The Hill Times, May 2). I agree. C-28 will provide a legal basis for these regulatory practices and limit government liability for regulatory negligence in the event of harm. The Health Minister also says that scientific review demonstrates the safety of chemical residues in our food. According to Sandra Steingraber, PhD, an internationally recognized expert on the environmental links to cancer and reproductive health, the scientific community does not know what levels of chemical exposure in food are sufficient to endanger the health of human adults, and know even less about their effects on children. Many of the contaminants in our food have never been adequately screened for their ability to cause cancer. Even less thoroughly have we tested their ability to affect fetal brain growth, contribute to miscarriages, disrupt hormonal signaling, alter the onset of puberty, or undermine fertility. In keeping with Minister Dosanjh's commitment to openness and transparency, Canadians should be provided with Health Canada's risk assessment that established a "safe" level for estradiol, the growth hormone used in industrial beef production. Peer-reviewed scientific evidence indicates that estradiol--approved for use by Health Canada--is a complete carcinogen. Michael McBane Canadian Health Coalition Ottawa, Ont.