Sentence:  Halton says, for example, that if there are bylaws that prohibit trafficking in fuel in a community where the non-sniffable petrol, <WSD>Opal</WSD>, had been introduced it would be the job of the local police to enforce the law. Her department, on the other hand, was dealing with the issue of the availability of <WSD>Opal</WSD>. 
Meaning of the word marked with <WSD> tags:  A type of petrol made by (British Petroleum) designed to be unable to be used for petrol sniffing.<ref>[http://www.bp.com/sectiongenericarticle.do?categoryId=9008933&contentId=7016884 BP article on Opal].</ref>(Developed 2005.)