Thanks for the thoughtful response . Oddly enough , I am very familiar with the process for creating butyl rubber by the cryogenic copolymerization of isobutylene and isoprene . I don ' t know if its a good time to offer ideas for alternative tests , given the pending filing of an agreed testing motion . nbsp I will look for the Svenson publication you referenced do you have an online source . If the decomposition rate you referenced can be tied to a reasonable scenario for planting the blood , I think it may be helpful for rebutting the EDTA result . For instance , if the planter poured 2 to 4 ml of blood from the vacutainer into a clear glass container , and exposed the container to sunlight for one hour in the course of his or her escapade , the paper may suggest the EDTA would have decomposed below the threshold of detection . nbsp Alternatively , if the decomposition could have occurred during the process of drying , that would be even better . Its unlikely the car windows were open though . nbsp If it were you , what would you have transported the blood in ? If they had a syringe and needle they may have taken it out through the hole in the stopper , but FBI agent ML testified the vial had been opened . I was thinking maybe a pill bottle , but that might contaminate the blood with drug dust . nbsp The limit of the detection that ML testified to for his protocol was 13 ugml . I think that works out to 13 ppm , slightly above the 5 ppm in Svenson . ML tested the original vial and found it still contained a detectable amount of EDTA . I think he even diluted it several times and was able to detect it . I would have to reread his report to remember all the details . nbsp Thanks again .