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<p>[QUOTE=&quot;yakpoo, post: 1255552, member: 18157&quot;]That&#039;s similar to what you said in an earlier post...but even if they&#039;re evaluating flow lines, two coins struck close in time from the same die would produce nearly identical flow lines...I would think.</p><p><br /></p><p>I&#039;ve been studying silver Washington Quarter die deterioration and I&#039;ve noticed that, due to the design, die cracks appear in similar areas across a wide variety of dates and mints. Oftentimes I see similar flow patterns as dies deteriorate, also. Granted, I&#039;m not suggesting that my 53 year old eyes are any match for Secure Plus, but I can imagine where &quot;not too much&quot; variation (lasering) of key features could begin to produce false returns.</p><p><br /></p><p>I have a little experience with biometric&nbsp; scanners (specifically, eye retina scanners) and most scanning mechanisms have a certain number of False&nbsp; Positive/Negative responses and are adjustable to&nbsp; minimize false returns...bringing the skill of the operator into the mix.</p><p><br /></p><p>Biometric scanning tools undergo significant testing under controlled conditions to determine false positive/negative thresholds under various conditions. I would be surprised if Secure Plus hasn&#039;t undergone similar testing and would be interested to know the results...not that I ever expect to see any.</p><p><br /></p><p>I hope you don&#039;t think I&#039;m being argumentative...just saying I wish I knew more specifics.[/QUOTE]</p><p><br /></p>

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