42 investigations services, namely, detective investigations, private investigations, missing persons investigations, and preemployment background investigations, and surveillance services related to all of the foregoing; detective investigations involving claims of sexual harassment, workers compensation, employment discrimination and insurance claims; national security background investigations; compiling inventories of personal items for individuals for insurance purposes; personal inventorying by means of video taping and household items for security and insurance purposes; undercover investigation and related consultation in the field of retail store operations; investigation and related consultation in the field of the level of security of businesses; design of electronic security systems; administering polygraph tests for others; reviewing standards and practices to ensure compliance with securities, environmental, immigration, insurance, gaming industry and transportation laws and regulations; computer services, namely, providing a database containing information useful in investigating individuals and companies; conducting background checks on prospective employees including employment verification