Many instances of numerical manipulations end up being discovered because the cheater didn't understand math well enough to hide their tracks correctly.
I have always called the argument that someone couldn't have possibly done it because it would be stupid to have done so the "Connie Defense" after a woman who tried to assert same before I picked her up and put her out of the house like Fred Flinstones cat.
This was after she was caught driving without a license while speeding and smoking weed in a state where it was still illegal.