This family concerns the surveillance of individuals at risk based on intelligence about those at risk and knowledge of high risk locations. The principle is that there is a system or an organisation that can provide an alarm to somebody that the concerned person is approaching the tracks. It can be also based on photography of regular offenders provided to staff or to other intervening persons. This requires to build a network of local actors working together to have likely better effects.

It is considered an organisational family because it concerns the way in which different concerned actors collaborate with one another, share information and organise their actions.

This family could also be referred to as a local suicide prevention plan.