Locard's Princible

In the early 20th century Dr.Edmond Locard made a theory that every contact leaves a trace its called forensic science. Locard thought that every time you touch something you would leave a print. For example if you touch something like a table with your finger or feet (For whatever reason) you will leave a finger print or if you use your feet a foot print. When police are searching in a crime scene they look for everything that could relate to the criminal. If you leave anything like your gloves shoes, socks and even false teeth and you are likely about to be found. Here are a few more things that criminals could leave behind that police use.

• hair
• tools 
• clothing
• licence plate
• fingernails
• DNA
• bullets

Who collects the evidence?
Forensic technician
What do they use?