Surveillance and Technical Surveillance Traditional on-the-ground surveillance skills are used in conjunction with state-of-the-art technology to produce imagery, evidence and information. Surveillance and technical surveillance is particularly useful in the fight against benefit fraud and to warn against and detect criminal activity.   Due Diligence and Intelligence Gathering Now a mandatory requirement in most business situations, 3rg’s range of due diligence services examine the interests, credibility, reputation and commercial track records of potential partners or investment opportunities. Due diligence incorporates investigation of funding, hidden liabilities, solvency, integrity and professional capabilities of those partners etc.