What aspect is crucial for establishing crime was committed in an investigation?

The collection of evidence is vital in establishing that a crime has been committed during an investigation. Evidence provides the necessary facts and details that can support or refute claims about what occurred. This includes physical evidence such as fingerprints, DNA, and weapons, as well as testimonial evidence from witnesses. Without the collection and proper handling of evidence, it becomes significantly more challenging to prove that a crime occurred and to hold suspects accountable. Evidence is the foundation on which investigations are built, allowing law enforcement to construct a clear narrative of events and ultimately bringing cases to closure through legal proceedings.

While community feedback, public reporting, and police presence can contribute to an investigation's context, they do not directly establish the facts of a crime like the collection of evidence does.