At one time it was considered essential for safety to provide a ground wire and three way plug for portable electric tools. No more. It is now the practice to "doubly insulate" the motor windings from a metal housing and provide only two wires and a two prong plug.
As the expert witness, I have a corpse to argue inadequacy.
The victim stood in shallow water, started drilling a hole, and fell down dead by electrocution. The electric drill was a quality product made by a reputable manufacturer. With a metal housing, a two prong plug, and no ground wire.
The drill motor was a conventional AC series motor with commutator and brushes. The commutator and brushes cannot be insulated, even though the windings can. Water had entered the ventilation holes and connected the commutator or brushes to the shaft, the shaft was in contact with metal reduction gears, which were in contact with the external chuck. The victim's body connected the chuck to the wet ground and so carried current from his hand to his feet.
Of course, the little circular in the box said that the drill should not get wet.