ASIS International (ASIS) Professional Certified Investigator Practice Exam

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Study for the ASIS International Professional Certified Investigator Exam. Practice with flashcards and multiple-choice questions, complete with explanations and tips. Prepare effectively and boost your confidence for exam day!

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Which of the following is NOT an example of tissue in the human body where DNA can be found?

Hair root
Saliva
Skin surface
Pulp of teeth

The correct answer is: Skin surface

The skin surface does not contain viable cells that can be harvested for DNA analysis; while skin does have some DNA present, it primarily consists of dead cells that do not contribute to useful DNA extraction. DNA is typically found in living cells, which are abundant in other examples provided, such as hair roots, saliva, and the pulp of teeth. Hair roots, for instance, contain the cells necessary for DNA extraction because the follicle remains attached, while saliva and the pulp of teeth are rich in viable cells that can be utilized for genetic identification and testing. Therefore, of all the options listed, the skin surface is the least likely source of usable DNA for forensic analysis.