S.S.
When you say that you don't see them store the pen - do you mean that you see them store it improperly, or they tell you they've got it handled and refuse to show you? I ask because there is a difference - and sometimes it is a control thing. As in, you want to be in control (because this is your baby), and he wants to make you scream.
My daughter wore knee length cotton shorts (not underwear) due to recurrent problems with UTI, but she never showed anything on the playground. I would talk to my attorney, were I you, and possibly CPS about supervised visitation.