A freeze on capital punishment in Ohio will continue through Jan. 15 after a federal judge extended a moratorium set to expire this week. The order issued by Judge Gregory L. Frost on Friday highlights the continuing problem faced by states in obtaining drugs to put inmates to death. It may also give Ohio more time to find sources for its preferred method — a single dose of compounded pentobarbital. At issue is a death penalty policy change that was announced in late April and that increases the amount of the sedative and painkiller the state uses. In January, unable to obtain compounded pentobarbital, Ohio switched to the sedative midazolam and the painkiller hydromorphone. On Jan. 16, a condemned man, Dennis McGuire, appeared to repeatedly gasp during the 26 minutes it took him to die.