My presentation topic

I've found a topic for my presetation. It will be Impression Analysis. It covers shoeprints, tire treads, and Tool marks. Like most branches of Forensic Science, it is based on the fact that everything is unique. All shoes, tires and tools are individualistic and may be traced back to the one present at the crime scene. Probably the most interesting thing that i found out is that even criminals that wear gloves will leave latent prints from the dirt, grease and oil on them. Of course since we don't have a database of every glove, there needs to be a lead as to who commited the crime, then gloves can be compared. We saw how they get the shoeprints at the crime lab. They apply special paper over the print and apply electricity to raise the dust left from the shoe print. Although most of these methods may be used as evidence, it might be hard to identify the exact shoe or the exact tire that left the mark, due to the fact that there isn't a database for all of these things. They might only be useful for class identification