Little question on invisible units

Assuming the unit is owned by the player who it is supposed to be invisible to, how do I make it not show up on the mini map?

Not show up on the minimap to who? He won't show up to enemies, I don't know why you would not want him to show up to the person controlling him... unless the Minimap was supposed to be more like a map than what it is. But sorry, I can't help you.

I can only think of 1 way to do this that is probably not necessary and there is probably a much easier and cleaner way.

I'm setting up a program for an fps and I'm trying to make a system of determining where on your target you hit. To do this I am using wisps that made pretty much unseen, however units you can't see aren't invisible so you can still shoot them, so I set their priority to zero so that only clicking on the unit will make your guy target them. With several big ugly triggers I made the wisps orient themselves between the target and the shooter and make targets for the head, chest, legs, and arms. These wisps move with the target through more big ugly triggers but I still see these wisps on the minimap and when I mass select around my hero. I set an allied deslector for the wisps, but I am still seeing these on the minimap so I would like to eradicate their minimap signal.