The perfect crime is a crime for which the perpetrator is never caught or, if caught, is not convicted of the crime. A stricter definition of the term states that to be truly perfect, a crime must never be detected, eliminating any possibility that a person will ever be arrested or brought to justice for a crime. It is not necessarily a specific crime, but it can be any type of criminal act that escapes resolution. The perfect crime usually reflects the criminal and does not serve to indicate poor performance on the part of those investigating the crime. More sophisticated or creative types of perfect crimes are often considered by writers who write detective novels; Such a crime is often used to challenge an investigator who acts as the protagonist. This can include murder in a “locked room” where a person is found dead in a room, often clearly the victim of murder, but the room is locked from the inside. Some researchers or investigators apply a stricter definition to the term, and for them, only a crime that goes unnoticed is a perfect crime. Although this means that only the criminal would know that the crime was committed perfectly, it would be impossible to solve because it would remain unknown. A perfect crime is generally considered an indication of a criminal`s genius or machinations. This type of crime is not solved not because of errors or omissions in the name of an investigation, but despite the work required to solve the case.
A perfect crime is essentially so carefully planned and carefully committed that there is no evidence that can indicate who committed the crime, at least not conclusively. In reality, such crimes are usually quite rare, and most criminals make many mistakes in committing a crime that provide investigators with evidence to use to find them. A murder committed by someone who has never met the victim before, who has no criminal record, who steals nothing and who says that no one could be a perfect crime. According to criminologists and scientists, this flippant definition of the perfect crime exists. Another possibility is that a crime is committed in an area with high public transport where the DNA of a large number of people is present, making sifting through evidence like “finding a needle in a haystack.”  Perfect crimes are crimes that go undetected, are not attributed to an identifiable perpetrator, or are not solved or intractable as a technical achievement of the perpetrator. The term is used colloquially in law and fiction (especially in detective novels). In some contexts, the notion of perfect crime is limited to undetected crimes; If an event is identified as a crime, some investigators cannot call it “perfect”.  I have read dozens of stories about the perfect murder. And while some of them are very smart, I can`t help but think they`re all a little artificial. It`s interesting to think about the perfect crime, but I think it would be a whole other thing to perpetrate it.
Most of these perfect murder stories are about the killer slipping or being knocked down by guilt. I think the reality is that most killers get away with it. I do not know if we would call them perfect crimes, but they outsmarted the police. It`s really hard to describe the perfect crime because it`s unrecognizable by definition. All the crimes we know of were obviously not perfect, and every crime we do not know has too many unknowns to really investigate its details. As some criminologists and others who study criminal investigations (including perpetrators) use, a perfect crime remains unsolved not because of incompetence in the investigation, but because of the intelligence and skill of the criminal.  In other words, the deciding factor is the primary causal influence of the criminal`s ability to avoid investigation and retaliation, rather than the ability of the investigating authority to perform its duties. Premeditated murder, where death is never identified as murder, is an example of one of the strictest definitions of perfect crime.  Other criminologists limit the scope to crimes that are not discovered at all.  By definition, one can never know if such perfect crimes exist.   However, many “near misses” were observed – enough to alert investigators to the possibility of a perfect crime.  When we think of perfect crimes, we usually think of murder or bank robberies.