Still later, when questioned by American authorities, “D” claimed that he had been pressured into retracting his statement by the Mexican police and that the retraction, rather than his first statement, was false. A portion of the American questioning was carried on with the use of a polygraph machine, with the consent of “D.” When told that the machine indicated that he was probably lying, “D” said words to the effect that he “must be mistaken.” Investigation in the meantime had disclosed that the Embassy extension number “D” said he had called would not have given him the person he said he spoke to, and that no one at the Embassy--clerks, secretaries, or officers--had any recollection of his calls. In addition, Oswald spoke little, if any, Spanish. That he could have carried on the alleged conversation with the red-headed Negro in the Cuban Embassy, part of which was supposed to have been in Spanish, was therefore doubtful. “D” now said that he was uncertain as to the date when he saw “someone who looked like Oswald” at the Cuban Embassy, and upon reconsideration, he now thought it was on a Tuesday, September 17, rather than September 18. On September 17, however, Oswald visited the Louisiana State Unemployment Commission in New Orleans and also cashed a check from the Texas Employment Commission at the Winn-Dixie Store No. 1425 in New Orleans. On the basis of the retractions made by “D” when he heard the results of the polygraph examination, and on the basis of discrepancies which appeared in his story, it was concluded that “D” was lying.[C6-578] The investigation of the Commission has thus produced no evidence that Oswald’s trip to Mexico was in any way connected with the assassination of President Kennedy, nor has it uncovered evidence that the Cuban Government had any involvement in the assassination. To the contrary, the Commission has been advised by the CIA and FBI that secret and reliable sources corroborate the statements of Senora Duran in all material respects, and that the Cuban Government had no relationship with Lee Harvey Oswald other than that described by Senora Duran. Secretary of State Rusk also testified that after the assassination “there was very considerable concern in Cuba as to whether they would be held responsible and what the effect of that might be on their own position and their own safety.”[C6-579]