DNA samples can be obtained from what sources?

Questioned or unknown samples collected from the crime scene can be any biological sample including: liquid blood or bloodstains, liquid saliva or saliva stains, and liquid semen or dried semen stains (including from vasectomized males) deposited on virtually any surface; genital/vaginal/cervical samples collected on swabs or gauze, or as aspirates; rectal/anal swabs; penile swabs; pieces of tissue/skin; fingernails; plucked and shed hairs (e.g., head, pubic, body); skin cells on drinking vessels, clothing (e.g., neck collars, waistbands, hat linings); slides containing tissue, semen, etc.; and liquid urine.