Economic or industrial espionage commonly occurs in one of two ways. Firstly, a dissatisfied employee appropriates information to advance interests or to damage the company. Secondly, a competitor or foreign government seeks information to advance its own technological or financial interest. "Moles", or trusted insiders, are generally considered the best sources for economic or industrial espionage. Historically known as a "patsy", an insider can be induced, willingly or under duress, to provide information. A patsy may be initially asked to hand over inconsequential information and, once compromised by committing a crime, blackmailed into handing over more sensitive material. Individuals may leave one company to take up employment with another and take sensitive information with them. Such apparent behavior has been the focus of numerous industrial espionage cases that have resulted in legal battles. Some countries hire individuals to do spying rather than the use of their own intelligence agencies. Academics, business delegates, and students are often thought to be used by governments in gathering information. Some countries, such as Japan, have been reported to expect students to be debriefed on returning home. A spy may follow a guided tour of a factory and then get "lost". A spy could be an engineer, a maintenance man, a cleaner, an insurance salesman, or an inspector: anyone who has legitimate access to the premises.