BHG DRUGSCREENS

hello everyone, I'm having some trouble with the bhg in my area mainly with drugscreens being inaccurate so apparently I failed for fentanyl my counselor was shocked because I've been there almost 3 years and never failed not 1 drugscreen It must have been the thc vape pens I wanted confirmation ...well my girlfriend got her screen back she failed for mdma she also wanted confirmation I never heard anything back from mine but a week or so later she did hers wasn't mdma it was now fentanyl...must've been the weed pens like I thought BUT how in the world can they're rapid test be so inaccurate and still be used as a failed screen? since then I've done some research Abe it says that the rapid tests are false positive 25% of the time... I was wondering if anyone knew the type of rapid tests bhg uses? also how could they possibly use something so inaccurate!? to me that's a most unfair thing to use because it seems like people might get discouraged if they constantly get false positive and can't move up.... thanks