Ambient and pervasive computing modalities present a vast new array of data collection systems connected to massive storage and powerful analytics. Somewhat belatedly have systems for securing that data been deployed, with ongoing efforts to improve data security from passive and active attacks. This presents a dual concern as to the relationships of public security and personal privacy with these systems: the use of the data generated by these systems for public safety, including law enforcement investigations of a variety of criminal actions and the legal/policy restraints to protect people from unbounded surveillance of their actions. How we balance public safety, personal privacy and autonomy is a legal-technical challenge that must be met. That challenge is all the more difficult as criminal elements seek to exploit vulnerabilities in systems of ambient intelligence, pervasive computing and the Internet of Things to hurt the innocent.