The StB's part in the fall of the regime in 1989 remains uncertain. The reported murder of a student by police during a peaceful demonstration in November 1989 was the catalyst for wider public support and further demonstrations, leading to the overthrow of the communist regime. According to StB agent , he was used to impersonate a fictitious dead student, Martin Šmíd. However, in 1992, the Czechoslovak parliamentary commission for investigation of events of November 17, 1989, has ruled out Zifčák's testimony, stating that "the role of former StB lieutenant L. Zifčák was only marginal, without any connection to critical events and without any active effort to influence these events. Investigation of related circumstances has indisputably proved that L. Zifčák's testimony that attributes a key role in November's events to himself is based on facts, which are either technically impossible and unfeasible, or contradict actions of persons mentioned by him, which aimed to completely different goals."