Is there any way of distinguishing whether the sample came from the kid ingesting it, or can it be a contaminant from contact with another person?
Depends on the type of test but yes.
You're off by a whopping
1,000,000 1,000,000,000.
5000mg is 5 grams.
Depending on the readings it could just be coke residue on their hands and stroking her hair. If they were using enough to buy bricks and chop it all up all day everyday, you'd likely find some incidental exposure.
It's questionable why only one kid got such a positive test which both favours and denies the accidental daddy stash theory, depending on how they tested it.
I've had some time to cool down. It might just be the kid always being in close proximity to mummy and daddy. Maybe she sleeps with them. I had a relative who slept with mummy until he was 14.
If she was always that close, spending a third of the day with mummy and daddy in such close proximity, then I can see a case here.
Now let that sink in, we're here arguing accidental exposure versus curiosity versus environmental contamination.
And the lesser of the evils is accidental exposure and contamination.
That's the state of Balldo. The bar is so low now.
@Dyn how hard is to wash off that contaminant for coke in a normal hygiene routine? I know they claim the kids were filthy but does it not come off after a bath? Does it persists after sample washing pre-test?
Very hard and yes. You're not washing that stuff off. That's one reason for having a cutoff. If you went to a shady nightclub with cocaine use, you might get it on you despite never knowingly touching it.
Seems average for decontamination.
DOI 10.1093/jat/bkaa143
They used many wash protocols with different preparation time, attempting to decontaminate the samples, and they compared it to samples of cocaine users.
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Assuming she never knowingly touched or sniffed daddy's snow, for her hair to test positive and be on the levels of a recreational user, she's had prolonged exposure to the substance.