Jellybabe...
No I haven't missed the point, he specificly mentioned Police and customs. You mention Immigration and BAA in addition, yes BAA should be searched. Customs and Police, if carring something which would be illegal for you, would not be for them, ie, in the case of police a firearm. They are specificly permitted to do so. Customs if they have seized one are the same. The point being so you search a police officer, and find say a tear gas spray....so then what are you going to do? Nothing, because the officer is permitted to carry it. It is therefore a waste of resorces, that should be used to search the threat, not the people there to deter the threat.