An anonymous reader shares a report: Samuel Straface thought he was the last one out the door one recent evening at the medical-technology startup he leads in suburban Boston. But as he passed a glass-walled conference room on the second floor, Dr. Straface says he saw a man he didn't recognize, sitting by himself in front of two open laptops and a tablet device. He continued walking a few steps toward the exit, but then, feeling uneasy, he turned back (Editor's note: the submitted link could be paywalled; alternative source). The man was later identified as Dong Liu, a dual citizen of China and Canada. And his after-hours computing at Medrobotics is at the center of an economic-espionage case brought by U.S. prosecutors. Mr. Liu is in federal custody, charged with attempting to steal trade secrets and trying to gain unauthorized access to the company's computer system, prosecutors said. If convicted of both charges, he could face a maximum sentence of 15 years in prison. "Mr. Liu adamantly asserts his innocence and we fully expect he'll be exonerated after a careful review of the evidence," said Robert Goldstein, Mr. Liu's defense attorney. The U.S. attorney's office for the District of Massachusetts declined to comment on the case beyond details in court records. Before his arrest, police said Mr. Liu told them he was there to discuss doing business with the company -- but Dr. Straface says no one had scheduled a meeting with Mr. Liu.