it probably makes a differance in the first week after you smoke to clean up, but after a whole month if makes little differance. you've most likely been clean for 2 weeks already.
and in regards to any pharms: as long as they're perscription and the testers are aware (like if you take vicodin you'd end up testing positive for opiates [amongst heroin, opium, etc] but vicodin is a legal opiate for persciption) of the meds you take that'd conflict with other similar controlled substances you're ok.
plus lorazapam is a benzodiazepine, normally you wouldn't be tested for that (assuming it was a standard test).

breath easy and relax