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Hair Strand Tests can show if parents have been using drink or drugs. Such tests play can a central part in Family Court hearings every year as judges decide whether children should go into care or not. Some barristers have been raising the alarm over the way the tests are presented and interpreted in the Famly Court. And, for the first time, File on 4 Investigates talks to mothers who nearly lost their babies – thanks to hair strand tests.Presenter: Sanchia Berg Senior Producer: Anna Meisel Producer: Mary O'Reilly Technical Producer: Kelly Young Production Co-ordinator: Tim Fernley Editor: Tara McDermottImage: Lead Senior Scientist Dr Ellie Menzies carrying out a hair strand test

As the government plans major reform of the England's Special Educational Needs system, File on 4 Investigates goes back to the floor, spending time with councils as funding decisions are made and with families trying to navigate a system in flux. From home-schoolers in Whitley Bay to getting on board a school bus in Hackney, we'll hear about the challenges of delivering services to tens of thousands of children with SEN each year. As the number of young people who need extra support rises how will Councils balance their books? Over a hundred schools have closed in England in the last five years. Analysis by the BBC’s Data team has shown that pupils with special educational needs have been disproportionately affected by school closures. These pupils made up 29% of those whose school has closed, which is higher than the national average. We'll hear how the disruption of a school closing can affect those with additional needs, and their families.Presenter: Hayley Clarke Producer: Nicola Dowling Technical Producer: Craig Boardman Production Co-ordinator: Tim Fernley Editor: Tara McDermott(Thanks also to the BBC News Data Journalism team)

Police have dealt with scores of cases involving home-made 3D printed guns in the UK in the last three years. Data obtained by File on 4 Investigates from the National Crime Agency shows that criminals and extremists have attempted to manufacture the weapons. We hear from police who successfully prosecuted a group who had manufactured printed firearms to sell on to criminal gangs. As Adrian Goldberg asks, how much of a threat are these printed weapons in the UK and what can be done to deter people from making them?Producer: Paul Grant Technical Producers: Cameron Ward & Nicky Edwards Production Co-ordinator: Tim Fernley Editor: Tara McDermott