In order for an officer to seize an item, the officer must have probable cause to believe the item is evidence of a crime or is contraband. The police may not move objects to get a better view. In "Arizona v. Hicks" (1987), the officer was found to have acted unlawfully. While investigating a shooting, the officer moved—without probable cause—stereo equipment to record the serial numbers. They also seized three weapons and a stocking-cap mask. The court granted the defendants motion to suppress all the evidence that had been seized because his Fourth Amendment rights had been violated. The plain view doctrine has also been expanded to include the sub doctrines of plain feel, plain smell, and plain hearing.