CSI Forensics

CSI stands for crime scene investigation. Forensic science is the use of science to find, collect and study evidence, like fingerprints, footprints and fibres, to work out what happened at a crime scene. A CSI forensics session lets families step into an investigator's shoes, using real techniques to examine clues and solve a made-up mystery together.

Crime scene investigators study a scene slowly and carefully. They photograph everything, search for tiny clues and collect evidence without damaging it. Each item goes into its own bag or container and is labelled, so everyone knows where it came from. Investigators wear protective suits, gloves and overshoes, so they don't leave their own hairs, fibres or fingerprints behind. Then scientists in the lab compare the evidence and help piece together the story.

Our fingertips leave behind invisible traces of sweat and natural oils. To find them, investigators brush a fine powder over a surface with a very soft brush. The powder sticks to the print and reveals its pattern. Clear sticky tape then lifts the print onto a card. Every fingerprint is unique, even between identical twins, and most fall into three main pattern types: loops, whorls and arches. Checking your own fingers is a great place to start.

Footprints and shoe prints can show where someone walked and what they were wearing. Fibres from clothes, strands of hair and soil can link a person to a place. Scientists also compare handwriting and inks, and use magnifying glasses, microscopes and special lights to spot things our eyes would miss. A good investigator never jumps to conclusions. They let the evidence tell the story.

It's brilliant for curious minds and budding detectives. Children love the gloves, the powders and the thrill of finding a hidden print, and it's a hands-on way to explore real science. Working as a team to crack the case gets everyone talking, from the youngest investigator to the grown-ups. It rewards careful looking and patience, so younger children may like a grown-up close by.

You might also like Explosive Science, Scavenger Hunt and Space Science.

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