Watch Dog is a service-application making a frontface cam screenshot every time someone makes an attempt to unlock your device.
Photos will be placed to your device storage (/mnt/sdcard/WatchDog/) and sent to an email (in full version only, in full version you will also get an info about your device current geo-location)
You don't have to root your device to install and use it. Recommended for 2.3+ Android version.
We all know that security is quite important thing in our days.
The Watch Dog application is your Android-pet which does not have to be feed and stay silent all the time.
But in the same time it carries out a heavy burden of guardian.
Use it and be sure you will always be know who dared touch your device.