Would spot checks be an option, if a punter leaves a positive review E-I could set asside a budget for a marshal to go out and see if what he has written is genuine or not, of course seeing as this is my idea I would be the most likely candidtate to be offered the position
No seriously, could the review arbitrator (NBT ) not be given the ability/authority/sanction to contact an escort to discuss any review/reviewer he deems suspect??