Our expert says:
Best would be, as Mom suggests, to get the blood / urine tests done. Many kids these days ( you don't mention the daughter's age ) use multiple drugs, so that the picture can be mixed, rather than there being specific individual recognizable signs to point to the use of one specific drug.
Mars summary of possible indicators seems reasonable. And Harris is right about the cost factor, and the fairly reliable sign when things go missibg to sponsor the habit
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