Of all the possible risks of snorting cocaine, sharing a bank note to do so is the least risky. No risk for HIV - if you want to ask about Hep B and C, post in those forums. You can find a list here: https://
www.medhelp.org/forums/list
This situation would have never exposed you to HIV, whether there was blood or not. Out of the body, the virus is so unstable and unable to infect. The only ways HIV is spread are:
-Unprotected anal/vaginal penetrations.
-Sharing needles to inject drugs with.
NO tested is needed after this situation.