The courtroom was still as he was sworn in and took his seat. Brennan said, “What is your occupation, Mr. Clarke?”
“I’m with National Biotech Laboratory. I work with deoxyribonucleic acid.”
More commonly known to us simple nonscientists as DNA?“Yes, sir.”
How long have you worked at National Biotech Laboratory?” “Seven years.” “And what is your position?” “I’m a supervisor.
So, in that seven years, I assume that you’ve had a lot of experience with testing DNA?” “Sure. I do it every day.
Brennan glanced at the jury.I think we’re all familiar with the importance of DNA.
He pointed to the spectators. “Would you say that perhaps half a dozen people in this courtroom have identical DNA?”
“Hell no, sir. If we took a profile of DNA strands and assigned it a frequency based on collected databases,
only one in five hundred billion unrelated Caucasians would have the same DNA profile.”
Brennan looked impressed. “One in five hundred billion. Mr. Clarke, how do you obtain DNA from a crime scene?”
Lots of ways. We find DNA in saliva or semen or vaginal discharge, blood, a strand of hair, teeth, bone marrow...
And from any one of those things you can match it to a specific person?“That’s correct.”
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