Investigators spend most of their time doing surveillance of some sort; learning to do this well is important for the success of your business. However, because of people who would use surveillance to infringe upon the rights of others, restrictions have been placed on its use. There are three basic types of surveillance: moving, stationary, and foot. However, surveillance can start out as one type and change quickly to another. Therefore, you must be prepared for any type of surveillance when you set out to watch someone.