first sorry for my bad englisch

I try to find my answer in forum, but dont find right answer.
I want to use Remove Traps Ingame ( I dont like this telekinise spell for it, i like to stay in hide, when ich open a chest) I am now gm detecting and start remove traps (hard to gain!)
But i not realy need this detect hidden, and now my question

Did i really need detect at GM for high end chest when i remove traps there, or can i drop it back to 50?
Hope for an answer and thx
Korades