Human rights campaigners warn action is needed to stop use of unlicensed drugs or other legally unsatisfactory methodsHuman rights groups have welcomed news that pharmaceutical firm Pfizer is to block the sale of its drugs in the US to perform executions, but warned that legally dubious alternatives could take their place. All companies licensed by the US government to manufacture drugs for state executions have now blocked their use in lethal injections. Pfizer’s withdrawal follows a campaign targeting pharmaceutical companies and their shareholders. The company said: “Pfizer makes its products to enhance and save the lives of the patients we...