Trac-B Exchange - Southern Nevada Harm Reduction Program was approved in early 2017 to help reduce the spread of HIV in "People Who Inject Drugs".[11] In Nevada, the sharing of needles for drug injections has led to an increase in the spread of HIV and hepatitis B and C. In an effort to reduce the spread of blood borne pathogens, Southern Nevada installed vending machines to give access to sterile needles to those using them for drug injections. Individuals who use these vending machines are required to register with Trac-B and are allowed 2 boxes a week.