No. It is not necessary for you to be present. Even if you are present it is necessary to pick up on your vibration by focusing my mind on that intention. Picking up your vibration can be done at a long distance all around the world. Usually I prefer to speak with a client briefly over the telephone to make it easy to pick up your vibration. I may also have seen you in person before as well.
I was trained by the Reverend Hanna Kroeger and two clairvoyants in Canada. The sole purpose of the saliva is to be able to dowse it for the 7 Physical Causes of Ill Health. The Reverend Hanna Kroeger would do a psychometric readings over saliva or live over the telephone speaking to the person without any saliva.. The single commonality between these two is focus and intent. Focus and intent allows one to focus and therefore pick up on a person's vibration to pick up the Aura's Energies. The saliva can be two weeks old, and your body may have changed slightly in that time, so it is not the saliva that is being tested, its actually your vibration that is being picked up, no matter where you are.
Due to my knowledge of specific high quality supplements such as the Kroeger Herb Remedies, and Hanna's Vibropathics™ which are available consistently in Canada and United States, I restrict my client base to these two countries.