"CSI" Puzzle

The CSI team uncovered a lot of important evidence while investigating the murder of Margo Dorton. Below are four pieces of evidence, shown under magnifying glasses. See if you can identify what each piece of evidence would look like in a normal unmagnified state. After you examine each magnified image, see if you can guess what item it is. After you have guessed, click on that piece of evidence to see the whole object unmagnified.