What is the simple physical test to show that a sample of water is pure?

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Check the melting or Boiling point. If the melting and boiling point is more or less than the original melting or boiling point the substance is impure.
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If you have a urine sample during a physical do they test that for drugs?

I would think only if someone orders it and pays for it. Why not call a Dr's office and ask them what all is tested in a general phyical urine sample? Ask if it includes Diabe