Nails: the DNA contained in fingernails is encased in hard keratin which protects it from degradation. In theory, it should be good to use for scalar transmission forever, and indeed some practitioners never change their specimens.
However, my research suggests that since photonic energy has been shown to be intimately bound up with DNA, nail specimens may be best renewed each month.
Russian experiments show that the photonic energy “imprint” which “shadows” DNA fades after this time.
If you choose to change your samples regularly, you may wish to substitute lightweight cigarette rolling papers for paper masking tape.
Saliva: cut a strip of blank paper (blotting paper is best) about two inches long and one inch wide. Place the top one-third of this in your mouth for about five minutes, or until it becomes saturated with saliva. Allow it to air-dry for about 10-20 minutes before placing it into your Remote. Good for about three days.
Buccal Skin Cells: this is how police do large-scale DNA testing after certain serious crimes. As above, use a strip of paper, but don’t allow it to soak in your mouth. Instead, rub the top one-third gently but firmly against the inside of your cheek for a moment. If it becomes wet, allow it to air-dry as above. Good for about 4-5 days.
Blood: for this you need a pack of lancets designed for diabetics to safely test blood sugar levels. These are inexpensive and available from all pharmacies. Wash your hands thoroughly first, then follow the directions on the pack. Smear the droplet of blood on the top one-third of a strip of paper. Allow to air-dry for a few moments. Good for about 5-6 days.
Hair: the shaft contains no DNA, only RNA. So it must have the root “bulb” attached. Good for about two days.