A former armed security guard at a PPL nuclear plant deemed psychologically unfit for duties has struck out in his attempt to pursue an Americans with Disabilities Act lawsuit against the power company.

On Tuesday, the U.S. Court of Appeals for the Third Circuit denied Daryle McNelis' appeal of a federal judge's summary dismissal of his lawsuit against PPL.

The company stripped McNelis of his security clearance and ultimately fired him for failing a mental fitness test. The test was given to him after the company learned he allegedly took bath salts and that he was paranoid that he was under constant surveillance. According to Third Circuit Judge Thomas Hardiman's opinion, McNelis believed his children's toys hid listening devices and he said he would kill whoever was spying on him.