In our experience, public health practitioners seeking to address a health problem often have just two very basic questions about the law: how can I use the law to create new interventions, or improve existing ones, to protect the public’s health; and will the law prevent me from successfully implementing certain interventions? In this way, the law is seen as either an opportunity for intervention to affect a public health problem, or an obstacle to enacting or implementing a desired intervention.In (...) addition, because some public health practitioners may not fully understand the intricacies of a given legal area, some possible obstacles to intervention may be either real or perceived. A real legal obstacle is not necessarily an insurmountable one, but it does have genuine legal force. A perceived obstacle has little, if any, true legal application to a given kind of intervention. (shrink)