Is my soldier wrong? "per regulation he must inform the chain of command if he is put on quarters."

I have a soldier who was sent home one day by the PA. As medics we are all part of the same section. He works in the clinic as one of the PA's medical screeners. Soldier was sick and since the PA noticed this, he did an exam on the soldier and then told him to go home, saying he would inform our PSG. Although the PA did send our PSG the email, I did not find out about him leaving until about 3 hours later. I understand my soldier's point of view, saying he did not consider telling me since the PA had informed him that his PSG would be notified, but myself and my first line feel as though I should have been informed. I was told that "per regulation he must inform the chain of command if he is put on quarter." Does anyone know if that is true, or have opinions on to whether or not my soldier is wrong.