The essential quality of daring required in their pursuits gives them an extraordinary degree of self-confidence, boldness, and vanity.

And to vanity most of them can trace their fall.
It seems incredible that Fisher should have returned to the United States after his discharge from prison and immediately resumed his operations without carefully concealing his impedimenta.

Yet when he was run down in a twenty-six family apartment house, the detectives found in his valise several thousand blank and model checks, hundreds of letters and private papers, a work on "Modern Bank Methods," and his "ticket of leave" from England! This man was a successful forger and because he was successful, his pride in himself was so great that he attributed his conviction in England to accident and really felt that he was immune on his release.
The arrest of such a man often presents great legal difficulties which the detectives overcome by various practical methods.

Of course, no officer without a search warrant has a right to enter a house or an apartment.

A man's house is his castle.