The Commission believes that a more formal statement of assigned responsibilities, supplemented in each ease to reflect the peculiar conditions of each Presidential trip, is essential. This would help to eliminate varying interpretations of Secret Service instructions by different local law enforcement representatives. For example, while the Secret Service representatives in Dallas asked the police to station guards at each overpass to keep "unauthorized personnel" off, this term was not defined. At some overpasses all persons were excluded, while on the overpass overlooking the assassination scene railroad and yard terminal workmen were permitted to remain under police supervision, as discussed in chapter III.163 Assistant Chief Batchelor of the Dallas police noted the absence of any formal statement by the Secret Service of specific work assigned to the police and suggested the desirability of such a statement.164 Agent Lawson agreed that. such a procedure would assist him and other agents in fulfilling their responsibilities as advance agents.165

Check of buildings along route of motorcade.--Agent Lawson did not arrange for a prior inspection of buildings along the motorcade route, either by police or by custodians of the buildings, since it was not the usual practice of the Secret Service to do so.166 The Chief of the Service has provided the Commission a detailed explanation of this policy:

Except for inauguration or other parades involving foreign dignitaries accompanied by the President in Washington, it has not been the practice of the Secret Service to make surveys or checks of buildings along the route of a Presidential motorcade. For the inauguration and certain other parades in Washington where the traditional route is known to the public long in advance of the event, buildings along the route can be checked by teams of law enforcement officers, and armed guards are posted along the route as appropriate. But on out- of-town trips where the route is decided on and made public only a few days in advance, buildings are not checked either by Secret Service agents or by any other law enforcement officers at the request of the Secret Service. With the number of men available to the Secret Service and the time available, surveys of hundreds of buildings and thousands of windows is not practical.

In Dallas the route selected necessarily involved passing through the principal downtown section between tall buildings. While certain streets thought to be too narrow could be avoided and other choices made, it was not practical to select a route where the President could not be seen from roofs or windows of buildings. At the two places in Dallas where the President would remain for a period of time, Love Field and the Trade Mart, arrangements were made for building and roof security by posting police officers where appropriate. Similar arrangements for a motorcade of ten miles, including many blocks of tall commercial buildings is not practical. Nor is it practical to prevent