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Drugs, in many cases, outside of working hours can have effects during working hours.

Many software developers working for companies have agreements that they can't compete with their current employer on what they do while employed there. It's something employees give up while employed somewhere.

In the name of safety, many jobs with safety issues have to give up certain things (i.e. drugs) while employed there.

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Many of the same jobs that drug test for safety issues also have alcohol use as part of their off hours culture.

This same logic would also apply to lack of sleep, and is often glorified as part of the culture (doctors).

It is not because it affects their job performance it is because the test they use can't measure if things were done a minute ago or 3 weeks ago.

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