Therein lies the problem with STD infections; you don't know for sure if the person is infected.
There is one main way (there are more ways) to get HIV. Someone like Miley Cyrus, you know how she could have HIV.
It is possible to have a false negative HIV test, particuarly early in infection with HIV. If a partner has a true negative HIV test, it's not possible to get HIV from them.
Yes, a history of herpes doesn't provide immunity from chickenpox.
HIV testing allows a person to know their HIV status and take appropriate health measures. Someone with a positive HIV test can start early treatment, for instance, and reduce the risk of transmission to others.
By taking an hiv test
that's attempted murder tell the police or someone at the clinic
You can't get infected with HIV from someone coughing on you.
No, you will not get HIV from drinking after someone.
exchange of bodily fluids with someone who does have HIV
You will need to be tested to confirm you have HIV.
Yes, it is possible.
You could get HIV / AIDS from doing that because you are sharing bodily fluids. You would only definitely get it if that person was HIV positive.