An unfortunate aspect of our society is crime but you can prevent and fight it with reasonably-priced security systems. Add any number of cameras, including infra-red for night time/dark rooms, with or without microphones to capture voices and sound, to your home, business or other property.
An affordable DVR (digital video recorder) records hours or days worth of footage. You can even access your camera system remotely. Want to check in on your employees on your day off or look in on your property while on vacation? A simple to use web interface gives you complete control.