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<p>[QUOTE=&quot;BadThad, post: 2551296, member: 17261&quot;]The &quot;sniffer&quot; cannot detect what has been done, that&#039;s impossible. It detects things that are still on the surface. Based on the analytical technology used in that instrument, it would take appreciable amounts on the surface for it to detect something. Also, it is limited by it&#039;s internal library of substances built by PCGS.</p><p><br /></p><p>As an analytical chemist of 28 years, I can tell you that the Sniffer is almost worthless. It is able to detect obvious things like fillers (putty) and grease, but not much beyond that. I believe the instrument is not much more than a &quot;fear tool&quot; designed primarily to keep people scared of submitting altered coins to PCGS.[/QUOTE]</p><p><br /></p>

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