UNDERSTANDING THE NEED
First we must understand the need for investigation, and is it necessary in helping determine or resolve pertinent issues and circumstances that are comprised around a particular sequence of events. If you need to comprehend the Who, What, When, Where, Why and How of the incident or event, than your answer is simple, and an investigation is required to understand those facts.
If these factors are relevant in determining your conclusion, then an investigation is needed to establish an explanation of events. Great caution and patience goes into the gathering of information. Witness statements and evidence must be meticulously and thoroughly scrutinized and documented. The saying is “If you didn't document it, than the incident never happened.”
INVESTIGATION Investigation is the process in which an entity or governing body looks into a situation, incident or criminal act concerning something or someone to discover the truth or to uncover the sequence of events which led to the incident.
ACCIDENTAL DEATH An accident is a specific, unexpected, unusual and unintended external action which occurs in a particular time and place, with no apparent and deliberate cause but with marked effects.
Surveillance is the monitoring of the behavior, activities, or other changing information, usually of people for the purpose of influencing, managing, directing, or protecting them. This can include observation from a distance by means of electronic equipment (such as CCTV cameras), or interception of electronically transmitted information (such as Internet traffic or phone calls); and it can refer to simple, relatively no- or low-technology methods such as human intelligence agents and postal interception.
All homicides include the killing of a living person. Homicide is broader in scope than murder. Murder is a form of criminal homicide; other forms of homicide might not constitute criminal acts. These homicides are regarded as justified or excusable. For example, individuals may, in a necessary act of Self-Defense, kill a person who threatens them with death or serious injury, or they may be commanded or authorized by law to kill a person who is a member of an enemy force or who has committed a serious crime. Typically, the circumstances surrounding a killing determine whether it is criminal. The intent of the killer usually determines whether a criminal homicide is classified as murder.
Covert operations and clandestine operations are distinct. "Covert Operation" as "an operation that is so planned and executed as to conceal the identity of or permit plausible denial by the sponsor. A covert operation differs from a clandestine operation in that emphasis is placed on concealment of identity of sponsor rather than on concealment of the operation." In a covert operation, the identity of the sponsor is concealed, while in a clandestine operation the operation itself is concealed. Put differently, clandestine means "hidden," while covert means "deniable." The term stealth refers both to a broad set of tactics aimed at providing and preserving the element of surprise and reducing enemy resistance and to a set of technologies (stealth technology) to aid in those tactics. While secrecy and stealthiness are often desired in clandestine and covert operations, the terms secret and stealthy are not used to formally describe types of missions.