One of the things that I learn was that there are people that the police use to gather more evidence and they are called the ESR (Environmental Science and Research) and they do DNA (Deoxyribonucleic Acid) testing. They test for hair/hair roots, blood to link the offender to the victim, clothing fibers and saliva which can be found in food and cigarette butts. Also in class previous to you the police coming to our school we learnt how the DNA can be amplified even though the sample is small you can increase the amount and this is called PCR (Polymerase Chain Reaction).
Also I learnt ECL (Electronic Crime Lab) is a lab where if you delete something off your electronic device then they will be able to retrace what you have deleted on your device. If the suspect has planned something on their computer or if the police will be interested in something on their computer then they will take the computer to ECL so they can let the police see what they have been doing. If you have posted or sent something on snapchat, facebook or instagram then it is on the internet for good so the whole wide world can see it.
