“…For the negative obligation of the state, state actions are not allowed to use lethal force except in circumstances narrowly defined by ECHR Article 2(2), in which, the "absolute necessity" is the key in determining whether a life is taken arbitrarily or not. For positive obligation, it is the state's promise to offer a redress after learning a lesson by reviewing a case of state killing and to make an effort in preventing future deaths (Baker, 2016a(Baker, , 2016bMavronicola, 2017). Thus, the coroner's court is an arena which an in-depth investigation can take place to look into the facts causing such deaths, which is also known as the "procedural obligation" of the state in accordance with ECHR Article 2:…”