A new documentary on BBC Two is looking at how new forensic techniques can help police re-examine old cases involving sexual assault and rape, helping to convict perpetrators from decades ago. Cold Case Investigators: Solving Britain’s Sex Crimes tells the story of three cases that were re-examined. One is that of Karen, who was raped in 1983. She joins Nuala McGovern alongside Detective Constable Hayley Dyas, who helped work on her case and finally get a conviction. On 28 July last year the British cyclist Lizzy Banks received an email from UK Anti Doping to say she had return two Adverse Analytical Findings. The letter stated she faced the prospect of a two-year ban unless she could establish the source. Thus began a ten-month journey investigating, researching and writing submissions to establish how the contamination event occurred. Absolved of any blame, having proved on the balance of probabilities that her test was contaminated, Lizzy speaks to Nuala about how the process destroyed her mentally, emotionally and professionally. The toy piano virtuoso Margaret Leng Tan is a leading force within avant-garde music and the first woman to earn a doctorate from the prestigious Juilliard School of Music in the US. She’s currently in London, performing her sonic autobiography Dragon Ladies Don’t Weep at the Southbank Centre this week. It’s a combination of spoken text, projected images and original music for toy piano, prepared piano, toys and percussion. It focuses on the obsessive compulsive disorder Margaret has had since her childhood. She explains how music helped her accept OCD as an integral part of who she is. Presenter: Nuala McGovern Producer: Kirsty Starkey Studio Manager: Duncan Hannant and Neva Missirian