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Have I mentioned yet that I really love X-Ray Extensions? ;)
I've talked to K.D. (main author of X-Ray Extensions and OGSE team member) about the bloodmarks on bodies though and he feels it is not possible in CS or COP unfortunately. Oh well, at least SOC mods using 1.0006 can use it :)
The only thing that sucks about it is not every place in the body can take a bloodmark. It's very picky and will only place them when struck in certain locations.