Suicide bag

A suicide bag, also known as an exit bag or hood,^[1][2] is part of a euthanasia device consisting of a large plastic bag with a drawcord used to die by suicide through inert gas asphyxiation. It is usually used in conjunction with a flow of an inert gas that is lighter or less dense than air, like helium or nitrogen. Continuing to breathe expels carbon dioxide and this prevents the panic, sense of suffocation and struggling before unconsciousness, known as the hypercapnic alarm response^[3]: 45 caused by the presence of high carbon dioxide concentrations in the blood.^[3] This method also makes the direct cause of death difficult to trace if the bag and gas canister are removed before the death is investigated. While asphyxiation by helium can be detected at autopsy, there is currently no test that can detect asphyxiation by nitrogen. For this reason, nitrogen is commonly the preferred choice for people who do not want the cause of death established.^[4][5][6]

Suicide bags were first used during the 1990s. The method was mainly developed in North America.^{[citation needed]}