United States Department of Justice

“ British found no evidence of any special susceptibility to CS associated with old age. Effects on the elderly were reported, but these were in regard to exacerbations of previous ill health. Human volunteers, of 50 years of age and upwards have been exposed to heavy concentrations of CS. The symptoms they experienced, and the time taken to recover from these, were no different than in young adults. ”

“ The concentration that has been estimated to be lethal to man is 52,000 mg/min3. This concentration, In the opinion of researchers, can only be attained in ideal laboratory conditions. Any concentration at this level, in relation to operational considerations, are essentially artificial. Research has determined that a high concentration of CS for a short time is less toxic than a lower concentration for a long time. ”

“ After CS exposure, no chromosome changes of any kind were found to-develop In the cells of healthy volunteers or persons who had been exposed to CS during the riots in Northern Ireland. Lethality
LCt 50 is the concentration of any chemical substance that will kill 50% of any given population. (Concentration = mg/m3) The smallest trace of CS that a man can detect is about 0.004 mg/m3. The concentration of CS that produces symptoms sufficiently unpleasant to cause people to leave an area Is 0.5 mg/m3. The concentration that will deter trained troops is 10 mg/m3. ”