How to Investigate a Crime. If you are in a position to investigate a crime you are going to have to exercise caution and a great deal of patience. Because of the importance of this task you must also understand the serious implications any misstep connotes. However, with a practical and sensitive approach, you may help catch a dangerous criminal or save someone's life.
Travel to the scene of the crime as soon as possible. By arriving as early as you can you increase the likelihood of seeing the crime scene in its original state.
Secure the crime scene with evidence tape so that the number of personnel allowed in and out is limited. Only essential traffic should be allowed in order to allow you to investigate the crime with minimal physical interference.
Research the history of the persons involved in the crime. If the crime allows it, interview all interested parties so that you can investigate the history of those who may have had a motive to break the law.
Take time to reflect on the various pieces of information in order to make sure all factors are being considered in their appropriate context. Enforcing the law requires you to consider all possibilities for the crime and its execution.
Preserve the integrity of any evidence you may have gathered in your efforts to investigate the crime. Tainted evidence can wreck an otherwise solid case.
Communicate across jurisdictions with other law enforcement officials to make sure vital information has not been inadvertently concealed. This ability to talk across borders is crucial if the crime you have investigated eventually goes to trial.