Security at a nuclear plant is governed by the Code of Federal Regulations, Title 10, Section 73.55 (10CFR73.55). Since the early days (1960's) of nuclear power, more and more restrictions have been imposed.
On a visit to a nuclear plant today, you might see:
In addition to these controls, fitness for duty requirements for all site personnel involve periodic random drug and alcohol testing. No drug usage is allowed, except by prescription, which must be pre-reported to your supervisor. No alcohol may be used less than 5 to 8 hours (depends on site) before work. Regardless, there are federal alcohol level limits that must be met.
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