Police station might not be a pleasing place to be in for some people, but for students like us, it was a fascinating trip. We split up into groups and went off to see different parts of a crime investigation.
Our group first went to the basement to see the polygraph (a.k.a. lie detector). We went through how exactly does the polygraph works. There were two rubber tubes that go around the chest and stomach that registers the respiration, two probes that are attached to the fingers to measure the electricity conductivity of the skin, and also a strap to the arm to measure the blood pressure. All those sensors are meant to measure the involuntary reactions of the human body in reaction to stress.
After that we went to a office to look at how the police use the laser (Light Amplification by Stimulated Emission of Radiation). It can detect illuminations emitted by some fingerprints, special fibers, drugs, and hairs including human and animals.
We also went to see the forensics lab at the police station, it had a firearms examination, where they compare the different bullets and match them with guns. The other section was the drugs inspection, and how they inspect what is in the drugs.
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