They&#x27;re probably not erased after a few years; these records have already been used for criminal investigations.  Considering their utility, I&#x27;d be surprised if they were erased.<p>There are a few cases in the news; here&#x27;s the first one that popped up on my search engine: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Melanie_McGuire" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Melanie_McGuire</a>