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>'MrMouse says his single-ply bills do not have magnetic ink, and so they won’t pass machines designed to look for the presence of this feature.'

Clever tip for detecting counterfeits, found in comments:

>'A good strong, neodynmium cylindrical magnet stuck to the side of something is a great way to check US currency. Just hold a bill by the corner and dangle it close to the magnet. The bill will show a slight, but very observable attraction. Easy and fast.'

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nevertheless, I can hit my local CVS and pay with my $100. They will just check the security strip. Easy peasy.

I think the point was that these bills have said security strip.

Which was the GP's point as well.

This is a key point. Detection by human is fairly limited as they only use their own, easily fooled, eyes and a detection pen, which can be fooled if starch-free paper was used by the counterfeiter [1]

[1] https://en.wikipedia.org/wiki/Counterfeit_banknote_detection...

And all you need to do is keep a potentially deadly piece of consistently underestimated hardware in heavily-trafficked areas!

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