please help me...

I have a question for you. While I was traveling in Mexico my friend did a stupid thing AND had unprotected sex with a girl he met. The following day he took her to the Red Cross AND they took blood from her to check for HIV. He got the results after two hours AND it was Negative. My friend is still a bit conccerned AND would like to know if it is possible to find out if you HIV in only two hours.