Pfft, not standard? Well, ok, we slide it across the mat so it's not exactly a throw, but under no circumstances do we ever hand a weapon back to uke.
I remember reading somewheres that it was a problem with police that they disarmed a bad guy and reflexively handed back the weapon to them, because that was how they practiced! Sorry can't find reference now. Makes sense to me on level of conditioning not to hand back weapon to uke.