Since we don't have much detail about this 'girl drug test story', it could cover a wide range of scenarios. It might be that the girl was a suspect in a crime and the drug test was part of the investigation. She could have been in a rehabilitation center and the drug test was to monitor her progress. Another possibility is that she was applying for a job in a field that requires strict drug - free policies and her drug test experience forms the story.
I'm not sure specifically which 'girl drug test story' you are referring to. There could be many stories involving a girl and a drug test. It might be about a girl who had to take a drug test for a sports event, or perhaps in a school or work - related situation where drug testing was mandatory.