Unless Mr. Smith has a kidney disease or some other illness that would cause him to shed epithelial cells, he will not have any cells of any kind and no DNA in his urine. How many people missed this? The writers, director, producers, everyone on set. And everyone on this board? Oops.
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I think you're missing the point that what Mr. Brooks says about DNA in urine does not need to be true. It only needs to be something that Mr. Smith might believe. The movie does not assert that there is DNA in urine ... Brooks just tells Smith that to get him to go along with his plan.
shareI probably missed this from earlier in the thread, however I think this goes to the OP.
URINE TROUBLE NOW...
so what the OP is saying is that I could theoretically pee on someone anonymously, and they'd have no way of tracing me?
this changes everything
"so what the OP is saying is that I could theoretically pee on someone anonymously, and they'd have no way of tracing me?
this changes everything"
If they don't have your DNA on file you can throw up and bleed all over them and they still can't trace you.
I think he just told him that to scare him.
shareSome reference sources
http://www.forensicdnacenter.com/forensic-faqs.html#3
http://www.clinchem.org/content/46/8/1078.full.pdf
http://www.hartnell.edu/faculty/jhughey/Files/dnaextractionurine.pdf
Oh my god, I've been smoking Cheese Whiz!
What if mr brooks wanted mr smith to be afraid about leaving dna in the crime scene?you re a doctor but mr smith wasnt,so he believed that,if i was in mr smiths place i would believe that
shareWhile it's true that urine is sterile (mostly) it's certainly not true that it's impossible to get DNA from urine. It's been done many times. It's not a good source for DNA though as urine itself doesn't contain any cells.
But urine is always contaminated with cells. Some blood often gets through even though it's not visible to the naked eye and cells shed from the bladder and urethra, it's not very different from shedding skin.
It surprises me that you as a doctor didn't know this. If's evident you've never practiced forensic medicine.
So what if there is no DNA in urine, Smith sure as hell didn't know it. Maybe he tricked him?
shareWell Dane Cook probably had a hard on the entire way to the killing site. Which means sperm would have been in his urine. bingo
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