A UN rights expert voiced alarm Thursday at US signaling of a “shoot-to-kill” posture both extraterritorially, including on the high seas and in Venezuela, and in law enforcement operations at home.Morris Tidball-Binz, the UN special rapporteur on extrajudicial, summary and arbitrary executions, voiced concern that “shoot-to-kill” posturing in Washington risked “lowering the threshold for the use of lethal force.”“There are no exceptions to the absolute and universal prohibition of the arbitrary deprivation of life,” said the independent expert, who is mandated by the UN Human Rights Council but does not speak on behalf of the United Nations.For all the latest headlines follow our Google News channel online or via the app.“International law does not allow states to kill on the basis of labels, perceptions of how someone appears, or allegations of wrongdoing,” he said in a statement.“Whether at sea, abroad, or at home, the use of lethal force must be strictly limited by the principles