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.
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.
No, you cannot determine if someone has HIV just by looking at them. Many people living with HIV may appear healthy and show no visible symptoms. The only way to know for sure is through testing, as HIV can remain asymptomatic for years. Stigma and misconceptions about the disease can lead to harmful assumptions based on appearance.
exchange of bodily fluids with someone who does have HIV
You will need to be tested to confirm you have HIV.