Investigative techniques are methods used by professionals, such as detectives and journalists, to gather information and uncover facts about a situation or event. These techniques can include interviews, where questions are asked to gather personal accounts, and surveillance, which involves observing people or places to collect evidence. Another important technique is forensic analysis, where scientific methods are applied to physical evidence, like fingerprints or DNA, to solve crimes. Additionally, data analysis helps investigators sift through large amounts of information to find patterns or connections that may not be immediately obvious. Together, these techniques help reveal the truth behind complex situations.