askchapo

Glocks have what's called a trigger safety. It's a little lever on the trigger that has to be depressed for the gun to fire. It's very effective; Unless someone deliberately puts their finger on the trigger and pulls its extremely unlikely for the gun to go off if it's dropped or in any kind of accident. Modern guns rarely if ever go off if they're dropped. Many can not due to their design.

The advantage of the trigger safety over other safeties is that it prevents the gun from going off accidentally while allowing the user to fire. This solves the problem of having to actuate a small button or lever during a stressful situation. It has an additional advantage - The trigger safety is always on. If the gun is cocked and ready to fire then the trigger safety is active. With a conventional safety once you turn it off it remains off until you turn it on again. The trigger safety re-sets as soon as you take your finger off the trigger. If you drop the gun after firing the trigger safety is on and will prevent the gun going off accidentally.

Safeties are entirely intended to prevent dangerous accidents. To prevent a gun from being used it's generally best to get a cable-lock that threads up through the magazine well, then through the action, and it then locked in place. This prevents the action from being closed which in turn prevents the gun firing. There's way way to get around this without opening the lock or cutting the cable.