On the basis of insufficient evidence, on 23 September 2002 Lenárt was acquitted of treason charges (along with his co-defendant Miloš Jakeš), related to his handling (or lack thereof) of the Prague Spring events in 1968. He was accused of attending a meeting at the Soviet embassy in Prague on the day after the 1968 Warsaw Pact invasion, planning to establish a new "workers and farmers'" government.