A Dauphin County man has pleaded guilty to charges of conspiring to violate the federal Clean Air Act by illegally modifying diesel trucks at a Lebanon-area auto shop, according to court documents.
Ryan Spencer, 33, was charged in an April 4 filing in the U.S. District Court for the Middle District of Pennsylvania. Spencer had previously agreed to plead guilty and waive a grand jury indictment, according to a plea agreement filed at the same time…