Preventing transmission of HIV from direct blood-to-blood contact, for example between injection drug users (IDUs) who share needles and other injecting equipment, is a challenge. Harm reduction techniques (e.g. cleaning needles and syringes with bleach before and after use), needle exchange programs, and supervised injection facilities (like InSite in Vancouver) are effective but not always practical or available. Of course, an HIV+ IDU can also transmit the virus through sexual contact. Drug-induced disinhibition and impaired judgment may hamper the use of safer sex precautions such as condoms, increasing the chances of passing on HIV.