The potential application of the PSE in Britain is extremely disquieting, especially as there seems no law to prevent its use. The most serious problem is that its primary application will be in situations where people may not object - such as pre-employment interviews. But it can also be used to probe a whole range of personal issues totally unrelated to job - union and political affiliations, for example. And, of course, the PSE can be used without the subject even knowing; its inventors analysed the televised Watergate hearings and told the press who they thought was lying. Finally, the device is not foolproof but depends on the skill of the investigator, who receives only a one-week course from Dektor.