Few questions for the pros here. A friend of mine gets random urine tests. She smokes bud and wants to have clean urine on hand. From what I read urine is good for 5-7 days at room temp, 2 weeks under refrigeration, and long periods up to a year when frozen. How accurate are these times? Can she microwave the urine to warm it slightly? If she does and doesn't need it, can it be re-refrigerated? No speculation please, only facts or your own personal experiences. Thank you!