How to get Mary Jane out your system without a detox?

So long story short my sister is pregnant… 7.5 weeks pregnant… she just recently found out… and she’s going to back to the OB in 24 days where they want to give her a drink test.. is it possible with that amount of time to get MJ out of your system without a detox drink/supplement?
How to get Mary Jane out your system without a detox?
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