Insert a 1/8-inch drill bit into a drill. Do not use any other size than this. A bigger drill bit will damage the entire lock set, and a smaller drill bit will not be effective. The one-way screws on the inside of most household dead bolts are 1/8 inch.
Position the drill bit in the center of the screw head.
Turn on the drill and push firmly. Drill until the bit is all the way through the head and starts to go through the body of the screw.
Pull the drill out. Since the drill bit is the same size as the screw, the screw head should automatically fall off on its own. If the head is still hanging on by a piece, pull it off with a pair of pliers. With the screw head out of the way, the deadbolt can be pulled apart.
Pull the two halves of the drill bit apart to gain access to other side of the one-way screws. They can be unscrewed by hand.