At 12:30pm, CST, on 11/22/'63, there were numerous persons that were known to be standing on the top step/landing and stairs of the TexasSchoolBookDepository Building as the Presidential Motorcade turned onto Elm St and drove past the Elm St Entrance. And, said persons being employed at the TSBD Bldg, most if not all, knew who LeeHarveyOswald was. And, if not then certainly later, knew him by sight and name.
However, not a single eyewitness/occupant of the top step/landing/stairs ever gave sworn statements/testimony that LHO was on said top step/landing/stairs as the Limousine carrying President and Mrs Kennedy, as well as Governor and Mrs Connally drove past the TSBD Bldg.