text: what are the pros and cons of dna fingerprinting?   dna fingerprinting is the process by which someone's unique dna sequence (3 billion letters) can be simplified to a visual pattern of alternating light and dark bands using some real advanced molecular genetics techniques.  the resulting pattern of dark and light bands constitutes a "fingerprint" of one's dna. pro: always comparison of everyone's dna based on a dozen or so highly variable dna sequences.  can be done by most genetics labs. is highly accurate, and depending on the number and type of sequences looked at, the chances could outweigh the number of humans on earth. allows positive identification of a person's presence at a certain location based on blood, semen or saliva.  con: fluids can be dropped at a crime unseen unknown to the dna's owner.  doesn't help distinguish between identical twins.