What equipment is used to extract DNA from human cell?

I'm doing a DNA project and I need information on the following questions:
+What equipment do scientists use to analyze DNA sample
+How is DNA used as evidence
+How does using DNA compare to older methods
+What are the benefits and limitations to using DNA to solve crimes
+Is DNA analysis foolproof
+Cases in which DNA have been used to free some people who be wrongly convicted.

If you can then send me some links of websites that hold the answers on them. Thank you so much.
in advance. ;)
+
Answers:
First of adjectives, you asked list of questions that a molecular biology for Forensic criminology nation.

I will try to answer some question.

1. DNA can be extracted by breaking cells and using solvents that will fashion DNA as long strands , just like cotton threads.
2. run cells and use liquid nitrogen to break cell.
3. DNA runs through some chemical beads due to electrophoretic movements you can seperate DNA based on its molecular shipment.
4. DNA analysis is mostly fool proof and is highly dependent on quality and amount.

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