And if you expect SAR to be tracking you down with dogs, leaving something with your scent on it could be useful. It could be a t-shirt you've worn and not washed, or just a washcloth rubbed over your body to collect your scent and kept in a ziplock bag. That way at least someone wouldn't have to break into your house and go through your laundry hamper.
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A gentleman should always be able to break his fast in the manner of a gentleman where so ever he may find himself.--Good Omens