My son hasn't lived with me since 1992, and I have lived in four different places since then. I still get mail from him from the Catholic high school he attended. In recent years, I have been getting membership application forms for him from AARP - which really makes me feel old. But fundraising organizations do request change-of-address information when the stuff they send can't be delivered, and they use that information to build an address history for a person. It's no deep, dark secret - keeping accurate address information is how marketing and fundraising people survive - and they share it within the industry. It's how I survived as a government investigator, too. I used many of the same techniques the marketers use, although my inquiries were more strictly regulated than those of the marketers. -Joe-
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