Surveillance Operation is the continuous observation (overtly or covertly) of persons, vehicles, places or objects to gather information concerning the activities and identities of individuals. Surveillance Operation involves careful data collection and analysis. Private Detectives or Private Investigators on surveillance monitor a subject's actions by following them in their residence and form place to place.
Domestic Problem Investigation is the kind of investigation that is used to collect facts, information and evidence to settle personal issues such as infidelity cases, child custody and fraud. Such investigation includes surveillance, background investigation of individuals.
Undercover Investigation is keeping one’s identity or using an assumed identity for the purposes of gathering information or evidence necessary to build a case. The purpose of these investigation is to gather information without a suspect\'s knowledge. Technology has played a huge role in the evolution of undercover investigations, allowing authorities to collect information for a case without putting the undercover investigator in harms way.