He posed for photos in St. Peter's Square alongside tourists and other actual high-ranking clergymen before strolling through a heavily guarded checkpoint using nothing but his slapdash thrift store disguise and an alleged membership in the Italian Orthodox Church, which is a church that doesn't actually exist.
In the Vatican's defense, there were over a hundred other cardinals milling around. It's probably pretty tough to spot an impostor amid all that ordained finery. However, we hasten to point out that one of the aforementioned attempts on Pope John Paul II's life was made by a man who was dressed like a priest. This should be something that every Vatican guard specifically watches for, not some so-crazy-it-just-might-work idea that takes them completely by surprise.
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"OK, guys, 'Let God sort them out' is not a valid vetting strategy."
Napierski was finally stopped just before making it inside the actual pope-voting chamber, and was escorted away by guards (which is a hell of a lot closer than you'd think a self-declared bishop in a slapped-together costume would get).