Should drug testing be legal for the workplace?

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Feel free to look at their sources at the bottom as well: Marijuana - InfoFacts - NIDA

Whether you think you are affected by your extracurricular activities or not is irrelevant. An employer has every right to fire someone who is using drugs, regardless of where it is. Comparing it to cursing outside of work is apples and oranges. Cursing doesn't affect your internal organs. Engaging in unhealthy behavior is not only dangerous to yourself but puts others in danger.

I'm all for random drug tests. Go for it. I have nothing to hide. It's all part of the real world. Your lifestyle choices affect more than just you.

Do you really think someone who smoked marijuana five days ago can't make fries at McDonalds or serve you your spicy BBQ wings at Applebees, or create a website for your business, etc?

You (apparently) do not do drugs or drink alcohol or eat poppy seeds, which is 100% fine. But there are people who indulge themselves in many different recreational activities that don't get drug tested (as a lot of companies do not drug test), and they are performing their job just fine. Who are you to say they can't do that?

I can see if your job involves something like being a police officer or fireman or a doctor, in which people's lives are in danger and decisions may not be made in the best manner.

As a result, someone who smokes marijuana every day may be functioning at a suboptimal intellectual level all of the time.

Not everyone is created equal. Does this mean a highly intelligent person who uses marijuana is brought to the level of someone with a lower IQ who doesn't use? The quote you made from that website is ridiculous.