At first glance, I thought 'why not?', but having thought about it a little more, my one concern would be that it may enable criminals to keep an eye on certain properties. I'm not up to speed at all on the technology of these things, and I'm probably barking completely up the wrong tree, but I presume there would be a time lapse, and if that time lapse was common knowledge, within a week or so a crook could easily find out when people were out on a regular basis. Far less obvious than hiding behind a lamp post, or sitting in a car all day to 'case a joint'. Or have I got the wrong idea?