http://www.poz.com/articles/arizona_nurse_prison_hiv_hepatitis_1_25090.shtml
a recently hired nurse at Corizon Inc., the private health care provider for the Arizona Department of Corrections, used one needle to stick the fingers of her inmate patients to test their blood-sugar levels, cleaned it off with alcohol and then used that same needle to draw insulin from the vials to administer the medicine. This error potentially contaminated the remaining insulin and exposed her patients to blood-borne pathogens.