Where is the line between artistic expression and criminal evidence? Can rap lyrics be used in court? A specialist detective in London’s Metropolitan Police explains how investigators analyse music lyrics, videos, social media posts and phone recordings to identify material that may be relevant to serious criminal investigations. Far from making assumptions based on musical style alone, the officer reveals the rigorous process used to distinguish between genre conventions, creative storytelling and information that may have genuine evidential value. Detectives examine specific references, timing, context and details that are not publicly known before considering whether material should ever be presented in court. The interview explores some of London's most serious criminal cases, including the murders of 15-year-old Leonardo Reid, Keanu Harker and Rene Graham. Through these examples, the officer explains how lyrics, handwritten notes, mobile phone content and music videos have sometimes helped investigators understand gang conflicts, establish context and support prosecutions. You'll also hear about concepts such as "scoreboarding", gang rivalries, status-seeking behaviour and the "authenticity trap", where individuals may reveal real-world information in a bid to gain credibility and recognition. The discussion provides a rare insight into how online culture, music and social media can intersect with policing and the criminal justice system. Importantly, the conversation also tackles the controversies surrounding the use of drill rap music in court, including concerns about usage, fairness, bias and artistic freedom. The officer explains the safeguards, review processes and evidential thresholds that are applied before material is considered for legal proceedings. Specialist investigators separate lyrics from evidence. Where an admission or description of a specific criminal act is revealed police work with prosecutors to present this as evidence in court, ensuring those responsible for violent crimes, including murder, will face justice. Whether you're interested in policing, criminal justice, music culture or the debate around artistic expression, this interview offers a unique behind-the-scenes look at a subject that continues to generate discussion across the UK.