A judge did not overstep his bounds when he concluded a defendant waived his right to attend his own trial on drug charges, a federal appeals court held.In a written opinion Monday, the 7th U.S. Circuit Court of Appeals rejected the argument that the judge presiding over David L. Shanks Jr.’s case ran afoul of the U.S. Constitution by conducting most of Shanks’ trial in his absence.“[T]he Constitution allows criminal defendants to waive — through their conduct — their right to remain present at trial,” a panel of the court …