- 15% of spies between 1947 and 1970 known to have used misused drugs or used illegal drugs, the proportion jumped to 41% during the 1980s when the spy population shifted to younger, lowranking military men.
- From a high of 30% between 1947 and 1979, the proportion of those known to be suffering from alcohol abuse declined to 24%during the 1980s, and to only 8% since 1990.
- Espionage used to be a career dominated by men. Slowly women have came into this field.
- As years passed from the war, technology had changed dramatically. Spy gadgets became smaller and more complex.
- Since the war spies have been involved in deeper espionage missions. Training for missions have evolved and become more covert.
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