Despite this, force is used routinely against juveniles by police. In 1974, the US Department of Justice assumed primary responsibility for delinquency prevention programmes and created the Office of Juvenile Justice and Delinquency Prevention, which has supported the "Blueprints for violence prevention" programme at the University of Colorado Boulder. Public health
The public health approach is a science-driven, population-based, interdisciplinary, intersectoral approach based on the ecological model which emphasizes primary prevention. Rather than focusing on individuals, the public health approach aims to provide the maximum benefit for the largest number of people, and to extend better care and safety to entire populations. The public health approach is interdisciplinary, drawing upon knowledge from many disciplines including medicine, epidemiology, sociology, psychology, criminology, education and economics. Because all forms of violence are multi-faceted problems, the public health approach emphasizes a multi-sectoral response. It has been proved time and again that cooperative efforts from such diverse sectors as health, education, social welfare, and criminal justice are often necessary to solve what are usually assumed to be purely "criminal" or "medical" problems. The public health approach considers that violence, rather than being the result of any single factor, is the outcome of multiple risk factors and causes, interacting at four levels of a nested hierarchy (individual, close relationship/family, community and wider society) of the Social ecological model. From a public health perspective, prevention strategies can be classified into three types:

Primary prevention – approaches that aim to prevent violence before it occurs.
Bleb or bulla
The most common disease causing blebs or bullae is paraseptal emphysema though centrilobular emphysema may sometimes be involved. Other conditions associated with lung bullae are:
Other conditions associated with lung bullae are:

Alpha 1-antitrypsin deficiency
Marfan syndrome
Ehlers–Danlos syndromes
Cocaine smoking
Sarcoidosis
HIV/AIDS
Intravenous substance abuse

Cyst
A pulmonary cyst is not necessarily the same type of cyst seen in many cystic lung diseases. The cyst for example in pneumocystis pneumonia is not the same as the pulmonary cyst. Cystic lung diseases include:

Langerhans cell histiocytosis (LCH)
Lymphangioleiomyomatosis (LAM)
Lymphocytic interstitial pneumonia (LIP)
Birt–Hogg–Dubé syndrome
Pneumocystis pneumonia
Pulmonary amyloidosis
Light chain deposition disease
Lung metastases rarely cause multiple cystic lung lesions. This form of presentation has been described in metastatic sarcomas. Incidental blebs and cysts
A focal lung pneumatosis that is an incidental imaging finding such as on a CT scan, without suspicious findings (such as findings indicating any of the diseases listed above), generally does not indicate further follow-up. Cavity

Two infectious diseases that are commonly associated with cavities of lung tissue are Mycobacterium tuberculosis and Klebsiella pneumoniae. The formation of cavities is due to tissue necrosis and creates an environment that allows the pathogen to expand in numbers and spread further.In the absence of infectious symptoms, a lung nodule with cavitation is a suspected lung cancer. == References ==