Why Would A Laser Printer Be Considered Valuable Evidence If It Along With The Rest Of The Devices In The Office Was Shut Off?

Why Would A Laser Printer Be Considered Valuable Evidence If It Along With The Rest Of The Devices In The Office Was Shut Off? Why would a laser printer be considered valuable evidence if it, along with the rest of the devices in the office, was shut off? The toner cartridge retains a latent image