Final answer:
The provided material does not mention the exact year the Private Security Board began regulating the security industry. However, it discusses periods of significant regulatory change, hinting that the late 1970s to the 1990s could be a plausible period for the establishment or reorganization of such bodies, including private security oversight.
Step-by-step explanation:
The question regarding when the Private Security Board started regulating the security industry appears to be somewhat misplaced, as the provided reference material does not directly address the inception of a Private Security Board. The materials provided discuss a variety of regulatory changes and agencies related to the public sector and broader industries such as the airline and banking industries but do not specifically mention the establishment of a Private Security Board.
However, if we consider the context of regulatory bodies and their evolutions, particularly during periods of significant change like the late 1970s with the Civil Service Reform Act, it is worth noting that many industries, including private security, likely experienced shifts in regulatory oversight during this timeframe on a national scale. Although the exact year of the Private Security Board's inception might not be detailed in the materials, this period of deregulation and restructuring of government bureaucracies would be a plausible time for the reorganization or initiation of industry-specific regulatory bodies.