I am not so sure I agree, the police have had to look at all the evidence, so by saying it was a stranger abduction they have effectively eliminated non-strangers. But although they can say that it was not someone she knew, but a stranger, that still leaves a lot of potential abductors. It may be that they can never identify who did it, but still remain in a position to eliminate specific people. I mean the police have said it was a stranger, but they have not come out and listed all people in the area and declared that they have not eliminated them, as they actually have to have a reason to suspect someone, not just the fact they have not been able to eliminate them. So i think the fact the police have eliminated non-strangers from he investigation means it is fair to consider strangers, but obviously that is difficult for us to do if we have no idea who lived in the area. We could just pick names at random, and tear them to bits, but not be in a position to eliminate them or prove they did it as we are not the police and do not have access to all the information or the powers to obtain relevant infomation.