I have been using surveillance cameras and other monitoring systems in my work for many years.
Any interactive system requires some level of surveillance.
Agreeing to be surveyed is the entrance fee for any number of emerging interactive and personalized services. Surveillance is a very tricky issue. Surveillance clearly constitutes some sort of invasion of privacy. On the other hand, many people are comforted by the thought that there is someone watching over them on city streets at night. Surveillance system becomes protective witness.