While Apple could not be reached for comment at the time of writing, The Register heard from MacExpo marketing director Matt Denton explaining that Greenpeace was at the show under the condition that they hand out leaflets only in their assigned area and not to take photographs at other stands."It was a valid stand with a valid message," said Denton "They breached their contract."Greenpeace is campaigning against Apple after it discovered presence of toxic substances in Mac laptops. According to Greenpeace's report, Apple products contain a number of hazardous chemicals like PVC and BFRs. The fan in the Mac Book Pro had a concentration of 262 mg/kg of TBBPA (a type of brominated flame retardant - BFR) which was the highest level in the fans among the five brands Greenpeace investigated.