The two leading articles in this area are A Simulation of the Affect of Blood in the Mouth on Breath Alcohol Concentration of Drinking Subjects, by J.G. Wigmore and M. P. Wilke, published in Canadian Society of Forensic Science Journal, Volume 35, Number 1 (2002) pages 9-16. The other article is The Affect of Blood in the Oral Cavity on Breath Alcohol Analysis, by M. Chu, D. L. N. Wells, R. G. King, J. Farar and O. H. Drummer, published in the Journal of Clinical Forensic Medicine (1998) Volume 5, pages 114-118.
These two leading articles on blood in the mouth are helpful. In the Wigmore and Wilke article, the subjects even held blood in their mouths, then spit the blood out, waited ten minutes, then took a breath test. Their conclusion was that there was no significant affect of blood in the mouth. This was based upon the blood being spit out and a minimum ten minute observation period. This is clearly different than the theory being proposed here, inasmuch as the gums are continuously bleeding and it stays in the mouth, you cannot get rid of it.
In the other article entitled, The Affect of Blood in the Oral Cavity on Breath Alcohol Analysis, the results were quite significant for the defense. The test was broken into four stages, Stage A, B, C, and D. Stage A was a breath test before solution was put in the mouth. Stage B was with solution in the mouth. Stage C was with solution in the mouth. And Stage D was a test after the mouth was rinsed.
In all of the groups tested, during Stages B and C, WITH SOLUTION IN THE MOUTH a statistically significant increase in BAC was found. This would confirm that blood in the mouth through Gingivitis and potentially through Periodontal Disease causes a continuous bleeding in the mouth and there is nothing that can be done to prevent the contamination of the test and of the test giving a false high reading of the subject’s Breath Alcohol Concentration.