What does marijuana have to do with it?

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I posted an article about a child dying in an unlicensed child care facility in Tennessee on my blog. The situation is terrible and sad, however the original source article mentions she was tested for marijuana and it found in her system. I ifnd this unusual to say the least. Why was she tested, and was it justified to test her? http://420-now.blogspot.com/2009/04/infant-dies-at-unlicensed-daycare.html