(39), In the absence of experiments indicating the contrary, any effect on the XRF results of the blood stains on the hands of Sheila Caffell is likely to be unimportant. As indicated previously, the presence of blood staining could have effected the efficiency of the swabbing, although there is no record in the notes that the swabs were bloodstained. If this was the circumstance, blood on the swabs could have contributed some of the elements detected, but the lead and bromine results are unlikely to have been materially affected...