DNA can be obtained from any cell inside a living being’s body. All living tissues including body parts like hair roots, nails, teeth, bones, tissues etc. and physiological fluids like blood, semen, saliva etc. in case of human beings can be used as DNA evidence besides seeds, leaves, pollen and other plant parts in case of botanical samples and hides of deer, quills of birds, tissues of animal, insects, microbial worms and viruses.