Correct me if I'm wrong, but if the urine had unique bacteria, the dna of that bacteria can be identified...click here for more info on that.
http://www.genelex.com/paternitytesting/paternitybook2.html
Urine Success with DNA analysis of urine is less common, as healthy individuals do not shed nucleated cells into the urine. Conventional testing is more likely to yield results, and is used in disputes over samples that have been tested for drugs.
Absorb suspected liquid saliva or urine onto a clean cotton cloth or swab. Leave a portion of the cloth unstained as a control. Air dry the cloth or swab and pack in clean paper or an envelope with sealed corners. Do not use plastic containers.
Submit suspected small, dry saliva- or urine-stained objects to the Laboratory. Pack to prevent stain removal by abrasive action or packaging materials during shipping. Pack in clean paper or an envelope with sealed corners. Do not use plastic containers.
When possible, cut a large sample of suspected saliva or urine stains from immovable objects with a clean sharp instrument. Collect an unstained control sample. Pack to prevent stain removal by abrasive action or packaging materials during shipping. Pack in clean paper. Do not use plastic containers.
http://www.benecke.com/developm.html
Due to the low amount of cells (epithelia) in urine, analysis of hypervariability in short tandem repeated sequences of genomic DNA (STRs) by use of PCR seems to be the only way of individualization [2,4,9]. To identify urine samples in cases of uncertain donorship like doping in sports or routine doping/ID controls, respectively, we co-amplified three short and sensitive non-overlapping STR loci. To take into consideration that storage may lead to degradation of DNA [9], short allelic ranges of &st;300 bp were chosen.
http://www.bxscience.edu/publications/forensicbio/articles/toxicology/h-toxi02.htm
Doctors from Johns Hopkins University and the Fox Chase Cancer Center in Philadelphia were able to detect a cancer- associated DNA change in the urine of men who had early stage prostate cancer. The researchers reported that the DNA urine test could also offer a useful tool for detecting early stage disease.
http://www.cnic.or.jp/english/topics/jco/reports/repo17.html
According to Asahi and other newspapers, urine samples of area residents were analyzed for DNA damage without the knowledge of the residents or the officials of Tokai-mura where JCO plant is located. The samples were taken during health examinations carried out in early October by Ibaraki prefecture. Not only were the DNA analysis carried out secretively, but the results were not reported to the residents or the officials of Tokai-mura either.