[zarzavat]

It's possible that could be destruction of evidence as well. Why should it matter whose meat sticks type in the decoy pin?

[MetaWhirledPeas]

Because one is a clear intent to mislead while the other has plausible deniability. "It was there in case of robbery."

[mattstir]

The prosecution would argue that you ought to have warned officers about the duress pin since this wasn't a robbery scenario.

[make3]

It's harder for them to argue you were actively destroying evidence; you could say that you had written the wipe pin there for a legitimate use case like both your wallet and your phone get stolen

[incompatible]

Makes sense, since you aren't using that pin every day and it would be easy to forget.