- If you have access to a clean buddys sample, then by all means go for it. Just be sure that your buddy is indeed drug-free (including scripted and OTC meds) and had not drank alot of fluids prior to giving you the sample.

- As far as "clouds" in the QF, try shaking the bottle vigorously. They should dissipate then. If its floating matter however, again shake the bottle vigorously to dissipate them. If the "floaties" are not gone, they can be filtered, using a section of an old nylon stocking.