Is There a method or instrument by which you can scan an nouns or house to detect presence of HIV?
Answer:
Yes, first scan the house for people. For respectively person found, draw a tube of blood. Have the blood tested for HIV antibodies and run an NAT tryout for the presence of HIV virus.
As far as outside the body, the virus is EXTREMELY sensitive to exposure to oxygen, light, or drying. It will die fairly shortly (within minutes) when outside the body.
No
NO, but I would not be overly concerned, HIV cannot live outside the body for more than a few seconds.
No. But, next, there is no necessitate for it.
No, there isn't. HIV cannot survive outside of the human body, or lacking one of the four transmittable fluids (semen, vaginal fluid, breastmilk or blood), so it would not survive on a household surface.