Thanks for the comforting words. In combination with a fresh bowl I'm definitely feeling a little more relaxed about it now. I'm glad you only noticed one bin. I got to stand in the room for a long time, and I looked to see if there was any other place for samples, and I couldn't find one. I'm guessing I mis-read the writing on the bin, it meant something else, or it didn't mean anything. There were too many samples in there for it to be exclusively filled with suspicious urine.