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The most dramatic result, though, was the one that showed a doubling in the number of people who were prepared to steal in a condition of disorder. In this case an envelope with a €5 ($6) note inside (and the note clearly visible through the address window) was left sticking out of a post box. In a condition of order, 13% of those passing took the envelope (instead of leaving it or pushing it into the box). But if the post box was covered in graffiti, 27% did. Even if the post box had no graffiti on it, but the area around it was littered with paper, orange peel, cigarette butts and empty cans, 25% still took the envelope.
The researchers' conclusion is that one example of disorder, like graffiti or littering, can indeed encourage another, like stealing. Dr Kelling was right. The message for policymakers and police officers is that clearing up graffiti or littering promptly could help fight the spread of crime.

A. 어휘
doubling 2배로 늘어나는 것. envelope 봉투. note 紙幣(지폐). stick out 내밀다.
those passing 지나가는 사람들. litter 어지르다, 흐트러뜨리다. peel 껍질.
butt 남은 조각. cigarette butt 담배꽁초. empty cans 빈깡통. promptly 신속하게.
spread of crime 범죄의 擴散(확산).