I was in an accident about 6 months ago where I was knocked off my motorbike and injured quite badly. I am still making weekly hospital visits and probably still off work for another couple of months. The person that hit me in my motorbike accident has been charged, however a couple of days ago I received a 'notice to appear' because when I was in hospital & they took my blood to make sure I hadn't been drinking the results showed 0.002 mg/kg of THC (part of cannabis) in my system. Does the medication & pain relievers the hospital had me on interfere with this reading as I had not had any drugs and don't understand this reading? What should I do? Also, are there time limits to how long after an accident this test should occur? Thanks!