If you dont have a partner to do the muscle testing,you can do this by yourself
You just have to make a couple of statements to make sure your not attached to the answer!
permission to check
all bodies present
there is any reason to doubt that
If you dont hold strong to these,go grab a glass of water and look at the brightest light in the room. Some people say one cant test oneself,but if your unattached to the answer,its ok....plus,there's lots of other stuff one can do to check accurately