Police vehicles in the basement were inspected during the course of the search supervised by Sergeant Dean.[C5-164] According to Patrolman Vaughn, the only vehicles that entered the basement while he was at the top of the Main Street ramp were two patrol cars, one of which entered twice, and a patrol wagon which was searched by another policeman after it entered the basement. All entered on official police business and considerably more than 4 minutes before Oswald was shot.[C5-165] None of the witnesses at the top of the Main Street ramp recalled any police car entering the basement in the 4-minute period after Ruby left the Western Union office and preceding the shooting.[C5-166] The possibility that Ruby could have entered the basement in a car may therefore be completely discounted. [Illustration: COMMISSION EXHIBIT NO. 2710] The Dallas Police Department, concerned at the failure of its security measures, conducted an extensive investigation that revealed no information indicating complicity between any police officer and Jack Ruby.[C5-167] Ruby denied to the Commission that he received any form of assistance.[C5-168] The FBI interviewed every member of the police department who was on duty in the basement on November 24, and Commission staff members took sworn depositions from many. With few exceptions, newsmen who were present in the basement at the time also gave statements and/or depositions. As the record before the Commission indicated, Ruby had had rather free access to the Dallas police quarters during the period subsequent to the assassination, but there was no evidence that implicated the police or newsmen in Ruby’s actions on that day.[C5-169] Ruby was known to have a wide acquaintanceship with Dallas policemen and to seek their favor. According to testimony from many sources, he gave free coffee at his clubs to many policemen while they were on duty and free admittance and discounts on beverages when they were off duty.[C5-170] Although Chief Curry’s estimate that approximately 25 to 50 of the 1,175 men in the Dallas Police Department knew Ruby[C5-171] may be too conservative, the Commission found no evidence of any suspicious relationships between Ruby and any police officer.