the rules principles outlined above can be used to evaluate specific needlestick prevention products. The present analysis is limited to situations in which a needle-tipped syringe is a necessity for the procedure therefore "needle-less" devices are not relevant to this discussion, although they do achieve the primary goal of actually eliminating the needlestick hazard in appropriate applications. Further, only post-use (dirty needle) sticks are considered because these are the ones that present a biohazard. While pre-use (still sterile) in advert needle are undesirable,they do not present a biohazard to the person injured.The analysis considers the biohazard to exist from the time of potential contamination (i.e when the needle enters the patient), to the time of final safe disposal