Defending a driving file involving allegations of intoxicating substances requires a total departure from traditional blood-alcohol litigation. Because the Crown cannot rely on an instantaneous, automated printout, prosecutors must cobble together a circumstantial case using subjective balance assessments alongside complex lab panels. Mennie Law attacks these files by zeroing in on the severe limitations of forensic chemistry. The firm aggressively interrogates the external variables that distort police clinical checks—such as poor garage lighting during eye tracking tests, physical fatigue during coordination exercises, and improper handling of blood vials during transit to the laboratory. We isolate the medical reality that presence does not equal active impairment to create an evidence-driven response to the prosecution theory.