The second part of the theory is that the police must adopt a Zero tolerance policing strategy. Instead of merely reacting to crime, they must proactively tackle even the slightest sign of disorder, even it is not criminal. This will halt neighbourhood decline and prevent serious crime taking root. Therefore, the police should focus on controlling undesirable behaviour on the streets (e.g. prostitution, begging and drunkenness) so that law-abiding citizens feel safe.