11.   The Safe Drinking Water Act stipulates which potentially harmful materials must be monitored, but leaves it to states to enforce its rules.

12.   Viruses can be annoying or deadly if they carry harmful genetic material.

13.   Officials warned on Monday that harmful materials and ordnance looted in unrest posed a danger to Albanians.

14.   Opponents said the Brent Spar, used in the British sector of the North Sea, held chemicals and other materials potentially harmful to the environment.

15.   However Rogers said opponents were losing sight of the intent of the bill, which is to prevent harmful pornographic material ending up in the hands of minors.

16.   It said parents played a crucial role in guarding their children from harmful material on the Internet and called for education of adults about the medium.

17.   The on-line industry is especially concerned because companies can be prosecuted if they knowingly allow the transmission of obscenity or materials harmful to minors.