Don't just get deadbolts for your doors. I saw a video once (in an ad for hardware) where a SWAT team was breaking down doors with different hardware on them. First, there was the deadbolt - it took one swift kick. Second, there was the deadbolt and hinges secured with extra-long screws that went into the frame of the house, not just the door frame - took a couple of kicks. Then they added an extra thick latch plate to the door jamb (again with long screws) - this took quite a few kicks. Finally, they put a small brass plate around the door knob (I used to think these were decorative) - they had to get a battering ram, and then it was hte hinges that gave way, not the latch. I tried to find the video on UTube, but I couldn't get the exact one.