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Many law enforcement agencies are currently responding to the problem of online crime by establishing proactive investigative units that track criminals on the Internet. Not only do these specialized teams face problems in the area of emerging technology, they are also faced with handling emerging legal issues. The current research examined the issue of the entrapment defense, and how previously established physical realm doctrine could be applied to the investigation of online crimes such as child pornography. Relying on previous case law it would appear that entrapment claims related to online sting operations involve consideration of: a) did the law enforcement officer continuously contact the suspect with the intention of trying to convince the individual to engage in a particular type of behavior, b) how long was the relationship between the undercover officer and the suspect, and c) how much, if any, reluctance to commit the criminal act did the suspect provide evidence of?

The various problems associated with the dispersion, advection and deposition of sulphur pollutants emitted into the atmosphere are reviewed in the light of experience gained during several long-range transport projects, in particular the O.E.C.D. project recently completed over western Europe. Modelling and budgeting the exchange of pollution between countries is briefly discussed and it is noted that although ‘statistical’ modelling may be satisfactory when considering long-term effects, the episodic nature of deposition and the complex meteorological flows often associated with these abnormally high depositions suggests that smaller-scale and detailed modelling is required if these situations are to be properly understood and forecast.