i am not an expert but i have had some experience. for reference i am at 135 and 5 feet 8. regarding a urine test, the test strips are a real good idea. the cutoff for thc on the quick test is 50 nanograms at the test site. if it is a positive result on that it will go gas chromotography/mass spectometry cutoff at 15 ng. it has been my experience that hydration a few hours before and up to the test point has worked for me in the past. definately i would recommend the test strips. cutoff level is 50ng. experiment with them days in advance so you can have a reasonably comfortable assurance beforehand. its not an easy task but it can be done.