Or how about this luminol gem: "to a sensitivity of 1 in 1,000,000 parts on the low end and 1 in 100,000,000 parts on the high end.[29]" The 100,000,000 number comes from a very old study (1930s IIRC) that has long been superceded. But even the 1,000,000 number may be...optimisitic. Consider the most recent
work I have seen: "We found that BlueStar® Magnum showed the greatest sensitivity compared to other formulations and detected 50 μl of 1/100,000 blood dilutions on both porous and non-porous surfaces."
Int J Legal Med. 2013 Jul;127(4):723-9. doi: 10.1007/s00414-012-0800-9. Epub 2012 Dec 21. "An evaluation of luminol formulations and their effect on DNA profiling." Patel G, Hopwood A. In other words, this wiki overstates the minimum detection by 10-fold to 1000-fold.