investigation, protection, security and surveillance services, namely, pre-employment background checks, white-collar crime investigations, embezzlement investigations, merger and acquisitions inquiries, assets inquiries, arson investigations, insurance investigations, probate investigations, patent infringement investigations, industrial theft investigations, workers compensation claims investigations, location of missing persons, providing contract guards, security surveys, executive protection services, residential security services, computer security services, electronic sweeps, video tape surveillance, conducting polygraph examinations, document and handwriting analysis, and fingerprinting