private surveillance assignment help

How has private surveillance changed in the last fifteen years, and what changes can be reasonably expected in the next five years?  By private surveillance I mean non-govermental surveillance; this would include private investigators and companies.  At least four things to take into consideration:

  1. The technology, or means, used for surveillance.
  2.  Who is doing the surveillance?
  3. Why are they doing it?

Four pages and at least four references.

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