Do they drug test at every visit?

I live in Tennessee and am on Tenncare. They test my urine at every visit. I know they test for sugar and protein, but are they also testing for drugs? Every time they take my urine sample the immediate next questions are "are you taking any medications?" "Are you ssuuuurrree?" I know if I've been using drugs or not! I kind of feel violated. Shouldn't they tell me if they're drug testing me? Or at least ask? Or are they legally able to do so just because I'm on government assistance?
What even happens to those who test positive for drugs? Do they inform them and tell them to stop or just wait til baby is born and cps takes the baby away? If they are drug testing all on gov assistance, the number of women who start turning down prenatal care is going to skyrocket. This can't be doing much more good than bad.

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