Have Your Locks Been Tampered With? Here’s How to Tell

1. Brute Force

This is the hastiest, and therefore messiest, form of attempted break in. Often a criminal will try to bash in a lock, drill through a deadbolt, or kick down a door, leaving a trail of twisted metal and splintered wood. There are less obvious ways to force through a lock though, so you might also look for some of the following signs of unnatural wear.

Signs of Brute Force

  • Paint circles from lock fixture movement (like it was loosened and retightened out of place)
  • Bent deadbolts or latches
  • Warped doors/doorframes

If you notice that your key is suddenly harder to turn than usual, this could indicate pin deformation—a result of more refined methods of lock manipulation like bumping or picking.

2. Bumping

Since the early 1900s, locksmiths have used a secretive technique called “ bumping” to open locks in a hurry. In 2005, a Dutch talk show revealed the process and, since then, the technique has been picked up by countless burglars worldwide.

To do this, burglars file down the teeth of a key into several points, sort of like a little saw. Next, they insert this “bump key” all the way into a compatible keyhole and withdraw it one click. Then they strike it abruptly with a blunt object, withdraw one click again, and repeat until the lock tumblers have all caught. Finally, they turn the key and open the door.

When done correctly, this method leaves little trace. Sometimes, however, hasty amateurs can leave identifiable marks.

Signs of Bumping

  • Fresh nicks around the edges of the keyhole from pounding the key a little too forcefully
  • Shiny metal edges that look like they’ve been recently hit

3. Picking

The third and most traditional method of tampering with locks is “picking.” This is where a person uses small tools like a flat screwdriver to turn the lock and a pick (sometimes even a dental pick) to rake the pin tumblers. Like bumping, once the tumblers catch the lock easily turns.

This takes more time and expertise than bumping, but is gentler and therefore unlikely to leave indications like warped pins or bolts. Nevertheless, as picks and shims (i.e., screwdrivers) wiggle around inside, they can cut into the edges, leaving marks.

Signs of Picking

  • Tiny scratch marks, showing fresh, shiny metal around the key hole (finer than from a key)

Now that you know what signs to look for and how they happened, you can consider options for rectifying the problem. One of the best ways to deal with lock tampering is to change your locks or upgrade them to hybrid digital/mechanical bolts, which are not as dependent upon tumblers and pins. You can also use a sliding bolt or a device which prevents turning of a deadbolt even after it is unlocked. At the very least, you can spray WD-40 in the keyhole to make it harder for pins to stick.

In cases of brute force entry though, lock upgrade might not be as helpful. Instead, it might be time to consider installing a home security system. That way even after you’ve changed locks and reinforced doors, if a criminal tries to force their way back in they’ll set off alarms or get caught on tape, offering you and your family yet another layer of protection. If you’re interested in this kind of monitoring, let SafeWise help you start comparing home security packages so you can find a company that meets your needs.

For more safety tips specific to your area you can contact your local police department or crime prevention council.


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