Nevada officials face yet another obstacle in carrying out the death penalty if inmates exhaust their final appeals. One of the two drugs that make up the lethal injection has expired, and companies that produce it refuse on principle to give the state any more. The state also hasn’t had a usable execution chamber since about 2011, when one at the shuttered Nevada State Prison fell out of compliance with the Americans With Disabilities Act. A new chamber is under construction in Ely at a cost of $858,000 and should be ready on Nov. 1.There are 80 people on Nevada’s death row, but no executions are pending. State officials plan to reach out to pharmaceutical companies nationwide in hopes of finding a supplier.