… Yeah thats the basic idea. You sound…impressed? Is it not an obvious solution? Though for lore’s sake and realisticness, all syringe loot found laying on the ground, in bushes etc should be changed to be dirty syringe. Perhaps change all the “clean” syringes that are desired (or at least most of them) to be in packages for sterility. Maybe make it so “dirty” syringe is percentage based bad juju like dirty water, though much higher chances obviously.
I don’t think hypodermic needles have that problem… at least not to a degree that would make it resource practical to include it. I suppose making it have “charges” like other objects could deal with this, though it would probably be much more code intensive.
I also have to disagree with sharpness being the “bigger” issue. The human body is very…sensitive about foreign objects in the bloodstream. Even air is lethal if there is much of it in the bloodstream, as for diseases and solid objects such as dirt or other particles being injected straight into the bloodstream I should think the possible bad results of such should be self evident enough.
If you simply meant that the syringe is only being used by you, then think about the fact that when not in use it is essentially rolling around in your backpack. Not exactly sanitary.