According to international law, the right to be free from execution includes freedom from any arbitrary or extrajudicial deprivation of life, as well as freedom from the death penalty even with due process of law (ICCPR, Part III, Article 6; Second Optional Protocol to the ICCPR, Article 1).
We measure all civil and political rights using a survey of in-country human rights experts. We ask questions about the frequency of violations of each right, then combine the answers with a statistical model that means we can compare responses across countries, and over time.
We then show the results as an estimated score out of 10, within an uncertainty band.
We also ask the in-country experts about who is at particular risk of human rights abuses. We show information based on their responses on the 'People at risk' tab on the country pages.
The short answer is that this sometimes happens when we convert our statistical calculations into scores from 0 to 10, and it doesn’t mean anything special.
The more detailed answer is that when we calculate our civil and political rights scores, the results could theoretically take on any value. Because there are not real limits on the scores that come out of our model, we sometimes end up with uncertainty bands that range beyond 10 or below 0. We still present those bands completely – and don’t just cut them off at 0 or 10 – to accurately show our level of certainty in the country's score.