US authorities are reportedly urging government agencies to set up programmes to identify disgruntled employees who may leak sensitive information.
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US broadcaster NBC has published an 11-page memo by US intelligence officials detailing the advice, according to the BBC.
The memo, sent to all agencies using classified information, calls for the introduction of ways to detect behavioural changes among employees with access to secrets.
The memo calls for insider threat detection programmes, the use of lie-detector tests and the monitoring of foreign travel and contacts by staff.