0442541_CORRPocketBook11Add3.qxp 14.09.2005 13:47 Page 25 Firearms shall not be used against persons in custody or detention except in the following circumstances: - In self-defence or defence of others against imminent threat of death or serious injury; - When strictly necessary to prevent the escape of a person presenting a grave threat to life.179 Intentional lethal use of force or firearms shall be permitted only when strictly unavoidable in order to protect human life.180 25