Long term ops outlays and procedures When performing long term surveillance of a target who may have foreign technical support, operational security must include post-operation planning. When the target is working with a foreign group, it is paramount that no single operation gives away ways, means or methods. Before concluding the evidence gathering phase of an operation, plans must be in place to retrieve all eavesdropping devices. Not only is it fundamentally imperative the enemy does not have access to your spytech, they must also be denied knowledge of how it is placed/implemented and what its capabilities are. All operations in this timeframe have multiple layers of direct evidence gathering/surveillance. The upper echelons of tech may never be used in court and may never be acknowledged to exist, even with regard to there being 'secret protections' acknowledging a device or technique was used. No paper trail. When wrapping up a surveillance operation, clean teams will recover all devices and must simultaneously perform forensic analysis of all locations to ensure the devices were not discovered but then left in place for counterintelligence purposes.  Q: How do you do this while a target runs high profile 24/7 operations? A: One method would be causing the building to be evacuated such as a bomb or Ricin threat. Trust the plan. I recognize some 'good guy' tactics and I am relieved that group is still in zone.