I have been "undetectable" for over 4 years and consistent with my medications. A recent "Body" article from Mr. Damon Jacobs on your site said: "When someone is undetectable for 6 months or more, they are humanly incapable of transmitting their HIV virus to others".
Given that, is it still necessary to inform a sexual partner of my condition?
Whether it's legally necessary to disclose your HIV status before consensual sexual activity depends on where you live. Many states and many countries have laws that make it a crime for people living with HIV to have sex without disclosing their status, regardless of the actual risk of transmission.
To find the law where you live, check out the Sero Project or the Center for HIV Law and Policy.
Punishing people for having sex while positive is not new, although an increasing number of respected authorities condemn the practice because it undermines public health strategies, misrepresents the risk of HIV transmission and perpetuates stigma. Click here for HIV criminalization resources.
If you are asking about a moral or ethical obligation to disclose your status, adults need to decide for themselves about the conversations they want to have before intimate contact.