If an object has no existence at rest, it cannot contract from its rest length.
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"Command authority" is the authority leaders have over soldiers by virtue of rank or assignmentwhich, though easy to assess, I suspect isn't really what you mean. However we do use the term as a variable attribute when assessing civilians for roles of leadership or responsibility. You could usefully talk to personnel officers in large companies, examiners for mariners or aviators (especially traffic controllers in those media) or police instructors.
Hence my suggestion that "DUA" should be replaced by "attempted manslaughter" regardless of the state or cause of intoxication.
Unlike alcohol, the active ingredients of Marijuana are not a single volatile chemical, so testing for dangerous intoxication will be more expensive, time-consuming and intrusive, whether by the roadside or in the workplace.
I am not sure that "other intoxicants" are a good basis for deciding what is good for us.We know exactly what is good for us: fish and chips, water, and nothing else. Any stimulant, depressant, or other psychoactive substance is potentially harmful. But so is skydiving and shark fishing. The legislative question surely is whether we harm or inconvenience others by our actions.
The medical impacts of tobacco, who knew what, was it ethical for them to suppress & confound the scientific evidence, and did they have a responsibility to tell the public. There are now slow and laborious efforts underway to restrict it to places where it won't cause so much damage public health (eg no smoking in the workplace, or around children).Now we are getting sensible about it.
We have seen a recent discussion in the UK about legislative action to control excess alcohol consumption, and also in Australia.But only among the poor. Minimum unit pricing won't stop me (or any member of parliament) getting dangerously drunk on good wine and fine malt whisky, for which I am already paying well over the minimum, but it will encourage smuggling, homebrewing and theft of cheap stuff. Total prohibition took the Mafia from being minor racketeers to being the fastest-growing business in the USA. They still control large areas of the food and drink industry, and for as long as drugs remain illegal, criminals will continue to run the country.
In other words, we are now trying hard to undo the damage done by common practice in a previous era where scientific evidence was not a criterion for acceptability.Who we? The dangers of smoking have been well publicised since the 1950's and are repeated on every packet of tobacco, but smokers surely have as much right to harm themselves as skiers and racing drivers, and some continue to exercise that right.
I welcome conducting scientific studies that may show that cannabis is "generally quite harmless", but the difficult part will be showing that it has an overall benefit to society (ie the benefits outweigh the costs), and so it should be legalised.What is the societal benefit of rock climbing or ocean racing? Both impose an occasional burden on rescue services and frequently kill or injure the participants, but nobody has thought to ban them.
I think the hardest part of the costs to assess will be whether legalising cannabis will lead to a reduction in harms from alcohol, tobacco or other drugs.One thing at a time, please.