Amulets for Protection from Spirits
Rinpoche gave the following advice on protections from spirits and how to wear them.
There is protection from spirit harm with numbers and other protection from spirits. There are two types of protection you can wear. One is square and one is not square, it is like three rectangles connected.
You should wear the protection all the time. You can wear it in the shower if it has a plastic cover on it. Then, the shower is not a problem. The worst thing is if you wear a buddha or a picture of His Holiness the Dalai Lama around your neck and then when you go to sleep it goes down under your arm or your body. For that reason, I don't like to give people buddhas to wear, because the person creates negative karma. Also, people often wear a buddha image on their chest. If you wear it for a short time, in public, to go shopping or something, for people to see and to plant the seed of enlightenment, then that is OK. But if you are wearing it when you lie down, then that is creating negative karma, and it also becomes dirty. If you are wearing it to go to the market or in public, it is OK.
If you lie down and you don't pay attention to the image, then you create negative karma. Also, if you are doing prostrations, you can try to push the blessed object back behind your neck. When I prostrate I try to push back the blessed pill around my neck behind my neck.
You can wear it with the thought to liberate others from oceans of suffering and its causes, delusion and karma, and to bring them to enlightenment, by planting the seed of enlightenment. With that kind of motivation, you can wear it in public, and then take it off when you lie down at home or whenever doing activities which are disrespectful to Buddha, including lying down or having the buddha under your body. If you don't pay attention this can happen.
Similarly, if you wear a ring with OM MANI PADME HUM on it, you shouldn’t use that hand when you go to the bathroom, as that can become disrespectful.