Doctors PrepareTo Inject TruthSerum in NegroKANSAS CITY, Mo., March 24.— Physicians today prepared to innocu-late Dillard Davis, negro janitor held in connection with the investigation into the murder of Zoe Zoe Wilkins, jwith “truth serum. Davis has told conflicting stories regarding his movements on the night j of March 15, when the murder wasf committeed. The janitor was de-j dared by two witnesses to be the owner of the knife with which the woman's throat was cut.The inquest into the slaying was resumed by a coroner’s jury today. —o-