Pickpockets operate most effectively when there are prospective victims in either heavily congested areas or in lonely places. In heavily populated areas, the large number of people around them covers the activities of these thieves. In lonely spots, they have the advantage of working unobserved. The main factor in the pickpocket's success is the selection of the right victim. A pickpocket's victim must, at the time of the crime, be inattentive, distracted, or unconscious. If any of these conditions exist, and if the pickpocket is skilled in his operations, the stage is set for a successful larceny. With the coming of big events, such as large concerts or marketing campaigns, the crowds move towards these activities and so do most of the pickpockets. However, some pickpockets will remain in certain areas all year around. They will concentrate on theater districts, bus and railroad terminals, hotels, or large shopping centers. A complete knowledge of the methods of this type of criminal and the ability to recognize them come only from long years of experience in performing patient surveillance and trailing of them. This knowledge is essential for the effective control and apprehension of this type of thief.