Up to 100 aspiring forensic scientists helped to solve 'murders' at two, three-day workshops last week. The secondary school students wore crime-scene overalls to take fingerprints, carry out blood tests and collect clothing fibres. They then used their findings to identify the killer in 'court' in the City University of Hong Kong and the Hong Kong Federation of Youth Groups courses. Kristy Wong Ho-lam, of Good Hope School, said she had to be careful not to contaminate the crime scene while collecting fingerprints. Lam Hon-wah, head of CityU's department of biology and chemistry, said: 'I hope the programme arouses the students' interest in forensic science.'